Commercial Restroom Efficiency: The True ROI of Waterless Urinals

Sustainable building design has shifted from an eco-friendly ideal into a financial strategy. Commercial facility managers are constantly seeking high-impact upgrades that reduce operational costs without sacrificing performance. To understand how modern restrooms can be optimized for maximum efficiency, we spoke with Liam Cope, a leading mechanical and electrical engineering expert and the voice behind the industry blog EngineerFix.

In this detailed guide, Cope breaks down the core mechanics, financial returns, and maintenance realities of modern no-flush urinal technology.

How Do Waterless Urinals Work?

Q: For facility managers unfamiliar with no-flush technology, what is the basic engineering behind these fixtures?

Liam Cope: From a user standpoint, a waterless urinal looks nearly identical to a traditional ceramic fixture. The core difference is that it operates completely independent of a building's water supply. Instead of relying on an automated flush valve to clear the bowl, the fixture uses gravity to direct liquid waste straight into the facility's drainage network.

To keep the restroom hygienic and completely odor-free, the base of the unit houses a specialized trap mechanism or cartridge. This component serves as a critical physical barrier, blocking sewer gases from escaping back into the room.

Maximizing Commercial Water Savings

Q: What makes waterless plumbing fixtures such a powerful solution for corporate water conservation?

Liam Cope: The most immediate benefit is a drastic improvement in commercial water efficiency, which translates directly to lower utility bills. The sheer volume of water saved annually per fixture is substantial:

• Upgrading from standard units: Replacing a standard 1.0 gallon-per-flush (gpf) model saves between 20,000 and 50,000 gallons of water annually per unit.

• Replacing legacy systems: Upgrading older 3.5-gpf hardware can save upwards of 100,000 gallons every single year for just one fixture.

Q: Can you explain the science behind the liquid sealant cartridge?

Liam Cope: Most modern systems rely on a replaceable cartridge or an internal trap filled with a lightweight, specialty sealant liquid. Because this fluid has a lower density than urine, the liquid waste sinks right through the sealant layer and flows into the waste line.

Once the waste passes, the sealant immediately reforms its top layer. This floating barrier acts as a reliable one-way check valve, trapping sewer odors beneath it while keeping indoor air clean and fresh.

Analyzing the Financial Return on Investment (ROI)

Q: How quickly can a business expect a return on investment after a commercial restroom retrofit?

Liam Cope: The financial returns are highly impressive, even when you factor in the ongoing operational costs of replacing cartridges and sealant fluids.

Depending on local commercial water rates, a single waterless unit can shave anywhere from a few hundred dollars to $2,000 off your utility bills annually. They also eliminate "phantom flushing"—a common defect in automated sensor valves that wastes thousands of gallons silently. In high-traffic environments, the utility savings often allow the hardware to pay for itself within a matter of months.

Best Practices for Waterless Urinal Maintenance

Q: What is the single most important rule for facility managers maintaining these systems?

Liam Cope: Routine cartridge replacement is vital. For a typical commercial property, the trap mechanism needs to be swapped out every 10,000 to 15,000 uses, which averages out to about four times a year depending on foot traffic. The liquid sealant requires more frequent top-offs.

Fortunately, this is a highly straightforward task. Janitorial staff or facility engineers can easily manage the swap using simple, specialized tools provided by the manufacturer.

Q: Are there specific cleaning protocols custodians must follow to prevent odors?

Liam Cope: Absolutely. Using incorrect cleaning chemicals is the primary reason facilities experience odor issues. Custodial teams must never dump large buckets of water down the fixture or use harsh, highly alkaline cleaners. Doing so strips away or dissolves the protective chemical barrier, allowing sewer gas to leak out.

Instead, janitors should use a pH-neutral or slightly acidic cleaner specifically formulated for waterless plumbing. The best practice is simple:

1.    Spray the interior bowl with a targeted, eco-friendly cleaner.

2.    Allow it to sit for a few minutes to lift surface grime.

3.    Wipe down the fixture with a clean microfiber cloth.

Installation and Plumbing Guidelines

Q: Can an in-house facility maintenance team handle the installation, or is a licensed plumber required?

Liam Cope: In-house facility engineers can absolutely handle the installation, provided they strictly adhere to local plumbing codes.

During a commercial restroom retrofit, two factors are non-negotiable: proper pipe slope for gravity drainage and correct line venting. Accurate venting is essential to protect the cartridge seal and ensure smooth flow. If your team has any doubts about the pitch of the existing drain lines or venting requirements, it is well worth hiring a licensed commercial plumber to guarantee a flawless setup.

How Waterless Co. Inc., Protects the Planet

Environmental responsibility is at the heart of Waterless Co. While our products save water, our team works daily to lower our overall carbon footprint. From our corporate headquarters to our fulfillment warehouse, we actively implement sustainable habits to protect our natural resources.

Here is a look at our daily eco-friendly operations:

Sustainable Supply Chain & Fulfillment

• Circular packaging: We extend the life of shipping materials by reusing boxes, padding, and pallets. When pallets wear down, we repair them instead of throwing them away.

• Lean shipping: Our team cuts down on waste by using the minimum amount of packaging needed to safely secure shipments.

Waste Diversion & Corporate Recycling

• Zero-waste mindset: We sort and recycle all workplace waste, including paper from desks, lunchroom food packaging, aluminum, plastics, and glass.

• Closed-loop printing: We keep printer toner cartridges out of landfills through dedicated recycling programs and prioritize recycled paper and cardstock for all internal and promotional printing.

Energy Savings & Smart Utilities

• Natural ventilation: We cut down on electricity by turning off the air conditioning when weather permits, opting instead to cool our facilities using natural airflow from open windows and gates.

• Upgraded facilities: Our headquarters and warehouse utilize modern, energy-efficient lighting systems to drastically reduce electricity consumption.

• Conscious water management: We practice what we preach by installing low-flow plumbing fixtures—including our signature water-free urinal—and utilizing targeted drip irrigation for our facility's landscaping.

Eco-Conscious Operations

• Green maintenance: Our cleaning crews use non-toxic, environmentally safe cleaning products to maintain a healthy office space.

• Right-sized logistics: We downsized our fleet by swapping out a large delivery van for a smaller, highly fuel-efficient model to curb transport emissions.

We are always looking for innovative ways to improve. Our team members constantly pitch new green initiatives, helping us push boundaries and find new ways to minimize our environmental impact.

Waterless No-Flush™ Urinals: A Smarter, Cleaner Way to Save Water

Upgrade your commercial restroom with Waterless No-Flush™ urinals—an innovative, water-saving solution designed to reduce water use, simplify maintenance, and support cleaner, more sustainable facilities.

Waterless No-Flush™ urinals look just like conventional urinals, making them an easy retrofit for many commercial bathrooms, public restrooms, schools, offices, stadiums, healthcare facilities, and high-traffic buildings. They are compatible with a standard 2” (52 mm) urinal waste line, and if a 1-1/2” (38 mm) waste line is already in place, a reducer bushing can be used.

Because these No-Flush urinals require no flush water supply lines, flush valves, sensors, handles, or moving parts, they help reduce common maintenance issues while delivering reliable, touch-free restroom performance.

How a Waterless No-Flush™ Urinals Works

The smooth, urine-repellent bowl surface helps liquid drain naturally by gravity—no flushing required. A disposable EcoTrap® is placed in the urinal drain outlet, replacing the standard water-filled urinal trap. Inside the EcoTrap, a proprietary, immiscible BlueSeal® liquid floats on top of the urine layer to help block urine odors and sewer gases from entering the restroom.

With only 3 ounces (100 ml) of BlueSeal, each No-Flush™ urinal can last for up to 1,500 uses, replacing approximately 1,000 to 4,500 gallons of potable flush water per fill. That makes waterless urinals a practical choice for facilities looking to conserve water, lower utility costs, and support green building initiatives.

Easy Cleaning and Low-Maintenance Operation

No-Flush™ urinals are cleaned in the same manner as conventional urinals—only faster—and require no special cleaners. BlueSeal replenishment is simple and accurate with the PortionAid, which helps minimize waste. Just fill the PortionAid by squeezing the bottle, then pour the measured amount directly into the EcoTrap holes.

Because there is no flush water involved, drain lines remain free of hard encrustations, helping reduce plumbing problems and maintenance disruptions. The EcoTrap® can also be easily removed with the X-Traptor® tool for quick access when needed.

Eco-Friendly Restroom Technology

For organizations focused on sustainability, water conservation, and operational efficiency, Waterless No-Flush™ urinals offer a smart alternative to traditional flushing urinals. The EcoTrap is recyclable, BlueSeal is biodegradable, and the zero-flush design helps reduce potable water consumption without sacrificing appearance, hygiene, or ease of use.

Contact us today to learn how Waterless No-Flush™ urinals can help your facility save water, reduce maintenance, improve restroom hygiene, and lower operating costs compared with conventional urinal systems.

Why Schools Develop Sewer Gas Odors—and How Maintenance Teams Can Track Down the Source

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Few building problems generate complaints as quickly as the smell of sewer gas. In schools, these odors can spread through classrooms, hallways, cafeterias, and restrooms, creating an unpleasant environment for students, teachers, and visitors.

Finding the source, however, isn't always straightforward. Large school buildings often contain miles of plumbing, numerous floor drains, crawl spaces, mechanical rooms, and rooftop vent stacks, making odor investigations challenging.

Before scheduling an expensive plumbing service call, maintenance personnel can often eliminate several common causes of sewer gas odors on their own.

A Maintenance Manager's Question

A facilities director from a Midwestern school district recently contacted us with a familiar problem.

"We've been trying to locate persistent sewer gas odors in one of our largest schools. We've inspected the basement, searched the crawl space, and still haven't found the source. Spring Break is coming, and we'd like to solve the problem before students return. Do you have any suggestions?"

While every building is different, this situation illustrates the troubleshooting process many school maintenance departments face.

Start by Identifying the Strongest Odor

Rather than inspecting the entire campus at once, determine exactly where the odor is most noticeable.

Ask questions such as:

• Does the smell occur only in one restroom?

• Is it concentrated near a hallway or classroom?

• Does the odor appear only at certain times of day?

• Is it stronger on one floor than another?

Narrowing the search area significantly reduces the number of possible causes and helps maintenance staff focus their efforts.

Look for Signs of Structural Movement

If the odor appears in a specific area, inspect the surrounding floor for evidence of settling or cracking.

Concrete slabs can shift over time, placing stress on drain piping beneath the floor. Even slight movement may loosen pipe joints or fittings, creating pathways for sewer gases to escape.

When investigating, maintenance personnel should carefully examine:

• Basement ceilings beneath the affected area

• Crawl spaces

• Floor cracks

• Pipe connections

• Drain lines below the slab

Visible damage isn't always obvious, but even minor separations can allow unpleasant odors into occupied spaces.

Examine Drain Connections

Loose plumbing fittings are another frequently overlooked source of sewer gas.

Drain assemblies serving sinks, floor drains, utility rooms, and restrooms should be inspected for loose joints or deteriorated connections. Even when water isn't leaking, escaping sewer gas can produce noticeable odors throughout nearby classrooms and corridors.

Including these inspections as part of routine preventive maintenance can help identify problems before they become major complaints.

Don't Forget the Roof Vent System

Every plumbing system relies on vent stacks that extend through the roof to equalize air pressure and allow wastewater to flow properly.

When these vents become obstructed, sewer gases may seek another path into the building.

Common causes of blocked vent stacks include:

• Leaves and debris

• Bird nests

• Insects

• Ice damage in colder climates

A quick inspection of rooftop plumbing vents may reveal an obstruction that's contributing to indoor odors.

One of the Most Common Culprits: Dry Drain Traps

If plumbing connections appear sound and vent stacks are clear, consider one of the simplest—and most common—causes of sewer odors: evaporated trap seals.

Nearly every sink, floor drain, and similar plumbing fixture contains a P-trap (or J-trap) that holds a small amount of water. That water forms a seal that prevents sewer gases from traveling back into the building.

When a drain goes unused for weeks or months, the water slowly evaporates.

Once the trap dries out, sewer gas can pass directly into occupied areas.

Schools are particularly susceptible because many drains receive little use during:

• Summer vacation

• Winter break

• Spring break

• Holiday closures

• Infrequently occupied classrooms

• Storage rooms

• Mechanical spaces

Floor drains that are rarely mopped or utility sinks that see little use are often the first places to check.

Restoring the Trap Seal

The simplest solution is often to restore the water barrier.

Begin by slowly pouring approximately one gallon of water into the suspect drain. This refills the trap and may immediately reduce odors.

For drains that remain unused for extended periods, many facility managers also apply a drain trap sealer to slow future evaporation.

Products such as EverPrime create a protective layer over the water in the trap, helping preserve the seal for much longer than water alone. After refilling the trap, adding about three ounces of the product allows maintenance staff to monitor whether the odor subsides over the next several days.

If the smell disappears, the district may have solved the problem without the expense of a plumbing repair.

When to Call a Licensed Plumber

Although many sewer odor problems stem from dry traps or minor maintenance issues, some situations require professional diagnosis.

If odors persist after checking drain traps, plumbing vents, pipe connections, and structural conditions, the next step should be contacting a licensed plumber. Persistent sewer gas may indicate damaged underground piping, failed seals, or other plumbing defects that require specialized equipment to locate and repair.

Preventing Sewer Odors Before They Return

The best approach is prevention. Schools can reduce future odor complaints by incorporating a few simple tasks into their preventive maintenance program:

• Refill floor drains before and after extended school breaks.

• Inspect plumbing vents periodically for obstructions.

• Check drain fittings during annual building inspections.

• Monitor areas with infrequently used sinks and floor drains.

• Consider using a drain trap sealer in drains that remain idle for long periods.

These relatively simple maintenance practices can help keep classrooms, restrooms, and common areas odor-free while reducing unnecessary service calls and minimizing disruption to school operations.

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Centuries Old Water Found in Egypt

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It remains striking that after thousands of years, Egypt still depends overwhelmingly on the Nile River for its freshwater. Today, the Nile supplies over 90% of the country’s renewable water resources, making Egypt one of the most Nile-dependent nations on Earth.

While Egypt utilizes underground water, it has historically represented a small share of total consumption. As of the late 2010s, only about 7% of Egypt’s water came from aquifers. While that figure has increased slightly in recent years, groundwater remains a supplemental—not primary—resource. However, Egyptian officials recognize that underground reserves must play a larger role as the population grows and water demand rises.

To map these vital resources, researchers from the University of Delaware were invited to assess Egypt’s groundwater reserves. The goal was to determine how much water lies beneath the surface, how old it is, and how much can be safely pumped for agriculture and human use.

The findings were surprising.

The Discovery of Ancient Egyptian Aquifers

Using advanced isotope-dating techniques, researchers discovered that much of Egypt’s underground water is extremely old—dating back up to 200,000 years.

Scientists originally expected to find "younger" water (50 to 100 years old) replenished recently by rainfall or modern irrigation. Instead, they uncovered a complex mix of ancient, slowly recharged water alongside younger water in specific regions.

The study confirmed that while Egypt's aquifers are still being replenished—especially in the Nile Valley and Delta where irrigation and rainfall seep into the ground—the deep reserves tell a different story. This discovery brings both a blessing and a warning for the region.

The Blessing: Vast Water Reserves

Egypt possesses substantial underground water reserves. These deep aquifers can act as a critical buffer to meet immediate and future needs, particularly during periods of severe drought or strain on the Nile River.

The Warning: The Threat of Over-Pumping

Groundwater must be managed with extreme care. Across the Middle East and parts of the United States, underground aquifers are being pumped far faster than they can naturally refill. Egypt’s deepest aquifers, such as the Nubian Sandstone Aquifer System, contain fossil water. Once depleted, these ancient resources will not replenish on a human timescale.

Shifting from Conservation to Water Efficiency

These findings point to a critical global reality: traditional water management must evolve. As surface-water sources face increasing strain and deep aquifers prove to be finite, slowly recharging resources, nations must find smarter ways to scale.

The ultimate solution lies in shifting from temporary water conservation to permanent water efficiency.

Conservation vs. Efficiency: While conservation focuses on changing behaviors to reduce consumption short-term, efficiency delivers lasting reductions through improved technology, smart design, and stronger management practices.

Implementing modern water-efficient technologies can yield massive savings:

• Commercial Upgrades: Integrating commercial waterless fixtures can radically lower a building's environmental footprint.

• Measurable Savings: Installing a single waterless urinal can save more than 25,000 gallons of water per year.

• Agricultural Innovation: Shifting toward precision drip irrigation prevents modern runoff from wasting precious aquifer yields.

Looking Ahead: Securing Egypt's Water Future

Egypt’s current situation shows that managing water consumption sustainably is an achievable goal. For now, officials have some breathing room; they do not need to rely heavily on deep, non-renewable underground reserves immediately.

However, this advantage should be treated as a strict window of opportunity. By investing in water efficiency today, Egypt can protect its ancient groundwater resources and ensure future generations have a secure supply.

Water efficiency is no longer optional. It is the foundation of sustainable water management for Egypt, the United States, and every nation confronting rising demand and finite supply.

Maximize Your Building's Water Efficiency

Ready to reduce your properties' water consumption and transition to sustainable infrastructure? Contact a Waterless Co. Specialist today to learn how waterless technology can save thousands of gallons annually.

Updated for accuracy as of 2026.

Colorado River Water Crisis: Why Facility Managers and Businesses Should Prepare Now

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For decades, the Colorado River has been one of the most important water sources in the United States. It supplies drinking water to millions of people, irrigates some of the nation's most productive farmland, and helps generate electricity for communities across the Southwest.

Today, however, that system is under unprecedented stress.

Despite emergency efforts by federal water managers to stabilize the river's largest reservoirs, experts warn the Colorado River Basin remains dangerously close to a tipping point. If current trends continue, businesses could face higher water costs, stricter conservation requirements, reduced hydropower generation, and increasing operational uncertainty.

For facility managers, property owners, manufacturers, and commercial real estate professionals, the message is clear: water risk is becoming a business risk.

Why the Colorado River Matters

The Colorado River supplies water to approximately 40 million people across seven western states and portions of Mexico. It also supports agriculture, manufacturing, tourism, data centers, healthcare facilities, commercial buildings, and numerous industries that depend on reliable water and affordable electricity.

For many years, reservoirs such as Lake Powell and Lake Mead acted as giant savings accounts, storing water during wet years and releasing it during dry periods.

Today, those reserves are shrinking.

Years of prolonged drought, higher temperatures, and increasing demand have reduced the river's ability to replenish itself. Even with emergency releases and operational adjustments, water experts caution that the system remains vulnerable to another dry year.

Emergency Actions Buy Time—But Don't Solve the Problem

Federal officials have taken extraordinary measures to keep reservoir levels from falling even faster.

These actions include transferring water from upstream reservoirs into Lake Powell and adjusting downstream releases to preserve critical elevations. While these efforts may temporarily stabilize conditions, they do not address the long-term imbalance between available water supplies and regional demand.

Unless the basin experiences several unusually wet years—or significant reductions in water consumption—the underlying challenges remain.

The Growing Business Impact

For many organizations, the Colorado River crisis may seem like a regional issue. In reality, its effects can ripple throughout the economy.

Potential impacts include:

• Rising municipal water rates as utilities invest in new infrastructure and conservation programs.

• More aggressive water restrictions affecting commercial buildings, campuses, hotels, and industrial facilities.

• Increased pressure to reduce water consumption as local governments adopt stricter efficiency standards.

• Higher electricity costs if reduced hydropower generation requires greater reliance on more expensive energy sources.

• Greater operational risk for businesses with water-intensive processes.

Organizations that depend on predictable utility costs may find budgeting increasingly difficult as water availability becomes less certain.

Facility Managers Will Be on the Front Lines

Facility managers are often responsible for balancing sustainability goals with operational performance and budget constraints. As water supplies tighten, that role becomes even more important.

Many organizations are already evaluating opportunities to reduce potable water consumption through practical efficiency improvements.

Examples include:

• Installing water-efficient plumbing fixtures.

• Detecting and repairing hidden leaks.

• Upgrading cooling towers and irrigation systems.

• Monitoring water consumption with smart metering technologies.

• Reusing water where local regulations permit.

• Replacing conventional urinals with waterless models in appropriate facilities.

• Educating building occupants about responsible water use.

Many of these projects generate ongoing utility savings while improving environmental performance.

Hydropower Challenges Extend Beyond Water

Declining reservoir levels also affect electricity production.

Hydroelectric facilities at Lake Powell and Hoover Dam depend on sufficient water elevations to generate power efficiently. As reservoir levels decline, electricity output decreases, potentially increasing pressure on regional power grids.

Businesses may ultimately experience higher energy costs or greater exposure to supply disruptions during periods of peak demand.

This makes resource planning increasingly interconnected. Water management and energy management are no longer separate operational issues—they influence one another.

Conservation Is Becoming a Competitive Advantage

Organizations that proactively reduce water consumption and use water more efficiently often realize benefits beyond lower utility bills.

Water-efficient facilities may experience:

• Lower operating expenses.

• Improved resilience during drought restrictions.

• Stronger environmental reporting.

• Enhanced ESG performance.

• Greater appeal to investors, tenants, employees, and customers.

• Reduced exposure to future regulatory changes.

What was once viewed primarily as an environmental initiative is rapidly becoming part of sound business risk management.

Looking Ahead

Most water experts agree that balancing Colorado River water use with available supplies will require substantial reductions in consumption across the basin. While negotiations among the basin states continue, businesses should not wait for policy decisions before taking action.

The organizations best positioned for the future will be those that begin improving water efficiency today rather than reacting to tomorrow's restrictions.

The Colorado River has supported economic growth throughout the American West for generations. Ensuring it can continue to do so will require cooperation among governments, utilities, businesses, and building owners alike.

For facility managers, the lesson is straightforward: every gallon conserved today helps reduce operational risk tomorrow.

Banishing Public Restroom Odors: The Hidden Role of Floor Drains

First impressions matter, and a foul-smelling restroom can instantly destroy a facility's reputation. Whether managing a school, corporate office, airport, or retail space, keeping restrooms smelling fresh is crucial for visitor satisfaction and perceived cleanliness.

Even a visually spotless restroom can harbor unpleasant odors, leaving guests questioning the building’s overall hygiene. For facility managers and maintenance crews, identifying and neutralizing the root cause of these smells—which is frequently escaping sewer gas—is a top priority.

Why Do Clean Restrooms Smell Bad?

While poor ventilation, missed spots during cleaning, and bacterial buildup are common culprits, one of the most frequently overlooked sources of foul odors is the floor drain.

The Anatomy of a Dry Drain Trap

To understand how this happens, consider a typical school shutdown over summer break. Imagine an elementary school in a dry climate like Albuquerque, New Mexico. After a deep clean in June, the building sits empty for months. By August, returning staff are greeted by a pungent, overwhelming stench.

What caused this? The extended vacancy allowed the water inside the floor drains to completely evaporate.

Beneath almost every commercial floor drain lies a U, P, or J-shaped plumbing pipe known as a trap.

• The Mechanism: This trap is designed to hold a small amount of water (usually two to four inches).

• The Barrier: This standing water creates a physical seal that blocks dangerous and smelly sewer gases from escaping up into the room.

• The Evaporation Problem: When a restroom goes unused, this water evaporates. Without that liquid barrier, sewer gases flow freely into the facility.

During regular operations, routine mopping and facility washing naturally replenish this water. However, during extended breaks, holidays, or seasonal closures, the trap quickly dries out.

More Than Just a Bad Smell: A dry drain trap allows more than just foul odors into your facility. It can release hazardous gases like methane and hydrogen sulfide, alongside airborne bacteria, viruses, and mold. In fact, dry drain traps were famously linked to the spread of the SARS virus in a Hong Kong housing complex in 2003, proving that this minor plumbing detail can have major health implications.

How to Prevent Floor Drain Odors

Fortunately, keeping sewer gases where they belong is relatively straightforward. Facility managers generally choose from three primary methods:

• Manual Replenishment: The most basic fix is having custodial staff manually pour water down every floor drain at least once a week. While inexpensive, it is labor-intensive and easily forgotten during long shutdowns.

• Automated Priming Systems: Facilities can install trap primers that automatically inject water into the drains based on timed schedules or pressure drops. While effective, these systems carry high hardware and plumbing installation costs, which multiply quickly across large buildings.

• Liquid Trap Seals (EverPrime): A highly cost-effective alternative is using a specialized barrier liquid like EverPrime. Adding just a few ounces to the drain creates a long-lasting cover that prevents water evaporation for months. It requires no plumbing modifications, works in all temperature extremes, and drastically reduces maintenance frequency.

Maintaining a Fresh Commercial Restroom

The best restroom experience is one that goes completely unnoticed. By proactively managing floor drains, facility managers can eliminate sewer odors, safeguard occupant health, and boost confidence in the building's cleanliness.

To learn more about optimizing public restroom odor control, reducing water consumption, or exploring waterless urinal technology, reach out to a Waterless Co. representative today.

School Summer Maintenance: The Hidden Health Risk of Dry Floor Drains

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Many school districts and facility managers utilize summer break to tackle deep cleaning, carpet washing, and floor refinishing. While these efforts are vital for a healthy school reopening, one critical area is frequently overlooked: facility floor drains.

During extended school closures, the P-traps beneath floor drains can dry out. This simple plumbing failure creates a direct pathway for hazardous sewer gases to enter classrooms and hallways, posing serious health risks to returning staff and students.

What is a P-Trap and Why Do Drains Dry Out?

A P-trap is a U-shaped pipe installed beneath most facility drains. Its primary job is to hold a small reservoir of water, acting as a physical barrier that blocks toxic sewer gases from escaping into indoor spaces.

When school buildings sit vacant for weeks, or when specific restrooms and janitorial closets receive no water flow, the water inside these traps evaporates. Once the P-trap dries out, the protective seal is gone.

The Dangers of School Sewer Gas Exposure

Sewer gas forms from the natural decomposition of waste. It is a toxic mixture of gases, including ammonia, methane, and hydrogen sulfide.

In high concentrations, these gases displace oxygen in enclosed spaces. Because children have faster breathing rates than adults, they are particularly vulnerable to the air quality issues caused by dried-out plumbing seals.

Hydrogen Sulfide Toxicity Levels

Sewer gas components are measured in parts per million (ppm). Even minor exposure can trigger health symptoms:

Concentration Level (ppm)

Health Symptoms & Effects

0.0005 ppm

Distinct odor (often described as rotten eggs or chemical burning).

0.01 ppm

Triggers nausea, headaches, and acute eye irritation.

0.02 – 20 ppm

Causes accelerated heart rate, cognitive impairment, and reduced coordination.

High Concentrations

Can lead to severe respiratory distress or asphyxiation in enclosed spaces.

Why Smell Isn't Enough: While sewer gas has a notorious "rotten egg" smell, relying on odor detection is a reactive mistake. By the time maintenance staff or teachers smell the gas, harmful exposure has already occurred. In severe cases, workers may require respirators just to safely enter the affected area.

How to Prevent Dry P-Traps During School Closures

Proactive facility management is the safest and most cost-effective way to prevent sewer gas backflow. Incorporate these steps into your summer maintenance checklist:

• Flush Drains Periodically: Assign custodial staff to run water down every floor drain, sink, and shower at least once every two weeks during the summer.

• Utilize Routine Cleaning: Ensure that routine floor mopping dumps greywater into floor drains to keep the traps filled.

• Use P-Trap Seals and Liquid Blockers: In low-traffic zones or during long shutdowns, utilize specialized, low-cost liquid trap primers or silicone trap seals designed to block evaporation for months at a time.

Ensuring a Safe School Reopening

Maintaining functional P-traps is a simple yet critical component of school facility management. By adding floor drain inspections to your summer maintenance routine, you can eliminate a hidden airborne health hazard and guarantee a safe, clean, and healthy environment for students and faculty this fall.

Restroom Odor Control for Building Service Contractors: Common Causes and Proven Solutions

Learn how building service contractors can identify and eliminate restroom odors caused by urine buildup, dry floor drains, poor cleaning practices, and inconsistent cleaning schedules.

For building service contractors (BSCs), effective restroom odor control is essential to protecting a facility’s image and improving the occupant experience. In many commercial facilities, people judge restroom cleanliness by smell. If a restroom or locker room has an unpleasant odor, occupants often assume the entire building is not being properly maintained.

The key to eliminating restroom odors is finding the source rather than masking the smell. While odor detection can be challenging, identifying the root cause is the most important step toward long-term odor removal and better restroom maintenance.

1. Urine Buildup in Tile and Grout

One of the most common causes of restroom odor is urine buildup in porous surfaces such as tile and grout, especially around urinals in men’s restrooms.

There are several ways to remove odor from grout and other porous restroom surfaces. Some contractors rely on floor machines for deep restroom cleaning. These machines can extract contaminants embedded in porous materials and remove the odors along with them.

In less severe cases, a high-performance restroom floor cleaner—many of which are now environmentally certified—may be sufficient. However, if urine odor has been present for an extended period, deeper mechanical cleaning is often required.

Another effective approach is the use of enzymatic cleaners for restroom odor control. These products break down odor-causing bacteria at the source. Once the area is rinsed, the odor is typically eliminated.

2. Dry Floor Drains and Sewer Gas Odors

Floor drains are frequently overlooked but can be a major source of restroom odors. When the water in a drain’s trap evaporates, sewer gases can escape into the space, negatively affecting indoor air quality.

Pouring bleach into floor drains is not recommended for odor control, as it can damage plumbing systems and harm the environment.

A better solution is a liquid trap primer, such as EverPrime, which helps maintain the water seal in the drain. Adding a small amount periodically can help prevent sewer gas odors from returning for extended periods.

3. Incomplete Restroom Cleaning Practices

Inadequate cleaning practices can also lead to persistent restroom odors. Cleaning efforts are sometimes limited to obvious surfaces like toilets, sinks, and floors, while adjacent areas—such as partitions, walls, vents, and corners—are neglected. Dust buildup, mold, and mildew in these areas can all contribute to unpleasant smells.

Product selection also matters in commercial restroom cleaning. General-purpose cleaners are not designed to eliminate odor-causing microbes. On the other hand, disinfectants are often unnecessary for routine cleaning and should be reserved for specific high-risk situations.

A more balanced approach is to use sanitizers as part of a restroom maintenance program. These products reduce most surface bacteria and help control odor without the overuse of stronger chemicals.

4. Inconsistent Restroom Cleaning Frequency

Cleaning frequency plays a significant role in restroom odor control. In recent years, some facilities have reduced how often restrooms are cleaned.

When contaminants remain on surfaces for longer periods, they can penetrate deeper—especially into porous materials—making restroom odors more difficult to remove. Maintaining consistent cleaning schedules is critical to preventing buildup and keeping restrooms odor-free.

Waterless Urinals and Restroom Odor: A Common Misconception

Waterless urinals are no longer considered a primary source of restroom odor problems. Improvements in both product design and cleaning practices have addressed earlier concerns.

When properly maintained, waterless urinals perform effectively and can remain clean and odor-free, often better than many other restroom fixtures.

By Robert Kravitz

Robert Kravitz is a former building service contractor.

Eliminating Sewer Odors in Schools & Buildings: Your EverPrime® FAQ Guide

Maintaining a clean, safe environment in commercial buildings and schools requires constant vigilance, especially when it comes to plumbing. One of the most common maintenance challenges facilities face, particularly during summer breaks or extended closures, is the sudden appearance of foul, toxic sewer odors.

To help facility managers, custodians, and building owners stay ahead of this issue, we’ve answered the most frequently asked questions about drain maintenance, dried-up P-traps, and how EverPrime® provides a long-lasting solution.

Why do sewer odors get worse in schools and offices during the summer?

When facilities close for summer vacation or holiday breaks, the plumbing goes unused. Every drain features a P-trap (also known as a U-trap or J-trap) designed to hold a small amount of water. This water acts as a physical barrier against underground gases.

Without regular water flow, the moisture in these traps evaporates. Once the P-trap dries out, a direct highway opens, allowing sewer gases to vent straight into your restrooms, classrooms, and hallways.

What exactly is sewer gas, and is it dangerous?

Sewer gas is a complex mixture of byproducts from decomposing waste. It primarily contains ammonia, methane, and hydrogen sulfide.

Aside from smelling terrible, inhaling these gases can pose serious health risks. Exposure can cause immediate symptoms such as:

• Eye, nose, and throat irritation

• Nausea and dizziness

• Headaches and cognitive fog

In high concentrations or enclosed spaces, sewer gas can be genuinely toxic. Because children breathe at a faster rate than adults, they are often more vulnerable to these airborne toxins when schools reopen.

Sewer Gas Toxicity by the Numbers (Parts Per Million):

• 0.0005 ppm: The distinct "rotten egg" smell becomes detectable.

• 0.01 ppm: Mild physical symptoms begin, including eye discomfort and nausea.

• 0.02 to 20 ppm: Severe symptoms occur, such as rapid heart rate, headaches, and loss of muscle coordination.

Proactive vs. Reactive Drain Maintenance

Can’t I just pour water down the drain to fix the smell?

Technically, yes—pouring water down a dry drain will temporarily refill the P-trap. However, this is a reactive approach.

By the time you or your staff smell the odor, your building is already contaminated with airborne toxins. Furthermore, in large facilities with dozens of floor drains, manually pouring water down every single trap weekly is an expensive, labor-intensive drain on maintenance resources.

How does EverPrime® prevent dry P-traps?

EverPrime® is a biodegradable liquid specifically engineered to solve the problem of evaporating P-traps. Instead of constantly replenishing water, you pour just three ounces of EverPrime® into the drain.

Because it does not evaporate under normal climate conditions, it forms a long-lasting, eco-friendly seal that keeps sewer gases trapped where they belong—underground.

What are the Benefits of Using EverPrime® for Commercial Facilities?

• Long-Lasting Protection: A single application keeps P-traps sealed for months, making it the perfect solution for summer school closures or vacant commercial properties.

• Cost-Effective: Eliminates the labor costs associated with manually flushing hundreds of drains every week.

• Eco-Friendly: EverPrime® is fully biodegradable and safe for your plumbing system.

• Peace of Mind: Ensures your building remains fresh, clean, and safe for occupants to return at any time.

Protect Your Facility Today

Don't wait for complaints about foul odors to take action. Incorporating EverPrime® into your seasonal shutdown checklist is the easiest way to guarantee a fresh, safe environment.

How are you preparing your facility's restrooms for the upcoming season? Contact us today to learn more about how EverPrime® can streamline your maintenance routine.