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AQUS Toilet Water Conserving System

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AQUS Toilet Water Conserving System

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AQUS can reduce metered water usage in a two–person household by about 10 to 20 gallons a day or approximately 5,000 gallons a year.

Why Green

  • Saves up 20 gallons of water per day
  • Qualifies for LEED certification points

Expert Rating:


The AQUS is based on the concept that using fresh water to flush the toilet is both unnecessary and wasteful. The AQUS system conserves water by reusing greywater from the bathroom sink to flush the toilet, thereby conserving the fresh water normally used. The device is a low maintenance, low cost, and highly effective water saving device. The AQUS is a small scale system for conserving water, and has a wide range of water saving applications including single family residences, apartments, condominiums, hotels, office buildings, schools, and government buildings. The system can assist architects, engineers, and developers in achieving their LEED certification and green building goals by contributing to water efficiency, waste water reduction and innovation points.


The AQUS System captures water from the bathroom sink and filters and disinfects it to provide reused water for toilet flushing.

  • Tablet dispenser - reused water is rinsed over disinfecting tablets.
  • Screen Filter - removes large particles such as hair or toothpaste
  • Water reservoir - holds 5.5 gallons of grey water
  • WCU - A patented water control unit delivers treated, reused water as the primary source for flushing the toilet.
  • Compatible with 2 piece, single flush toilets


Installation of The AQUS system is similar to installing a new toilet and/or an over-the-stove microwave oven. If a person is comfortable installing either or both of these appliances then they would be comfortable installing the AQUS. We believe that most end users will engage a certified plumber to perform the installation.

The system requires annual maintenance which takes approximately 15 minutes. The system uses three (3) disinfection tablets which must be replaced annually. The system also uses a removable screen to filter large particulate from the water. This removable screen should be pulled out, rinsed off and replaced annually.

How it Works

When the toilet is flushed, a 12 volt submersible pump inside the vanity tank is turned on. The 5.5 gallon vanity tank collects the reused water that goes down the bathroom sink and holds it until it is needed to fill the toilet tank. Any reused water in the vanity tank is pumped to the toilet to be used for flushing the toilet.

Size Chart

Size: 13 ½ X 15 ½ X 9 ½ inches
5 ½ gallons
Low voltage 12 V DC
Fill Control Unit:
Requires minimum 1.6 gallon two piece toilet tank with fill valve
3/8 inch
12 VDC Centrifugal Submersible Average Flow Rate: 1.6 gal/1 min 12 sec
System Weight:
13 lbs
Plumbing Certifications:
UPC Classified


Expert Review

The Leadership in Energy and Environmental Design (LEED) Green Building Rating System promotes green building construction practices by the creation and implementation of a national accepted benchmark for the design of environmentally friendly buildings. The LEED system encompasses energy efficiency, water conservation and other areas of sustainability. LEED green building has been adopted by architects, engineers, developers and other professionals who wish to encourage environmental excellence.

One of the two LEED points this system helps the building achieve is the “Innovative Wastewater Technologies” credit. One point is awarded for reducing sewage conveyance from the building by 50% over what is considered a standard building. The reduction in waste water by using the AQUS System will vary by building type and occupancy. This review looked at two cases; Residential building with a 4 person family, and a small office building with 8 occupants working 8 hour days 5 days per week with no urinals in the building.

The AQUS system can provide a residential home a 12 percent reduction in water use, and an office building a 26 percent reduction in water usage. This system coupled with other strategies, such as low water fixture rates, can get the waste water reduction above 50 percent. For states like California, Nevada and Arizona where water resources are of great concern, usage of the AQUS system is a no brainer.


The system operates with a 12 volt DC pump. An energy meter was used to measure the energy consumption during operation, as well as, the latent energy consumption during non-operation. Based upon the data collected, The AQUS system is expected to consume approximately seven (7) kilowatt hours of electricity annually. At an average cost per kilowatt hour of $0.07, the anticipated cost per year will be $0.50 per year.


Warranty for 1 year on all parts


According to the U.S. Environmental Protection Agency’s Office of Water, more than 4.8 billion gallons of water is flushed down U.S. toilets each day. The American Water Works Association estimates that if water–saving features were installed in every U.S. household, water use would decrease by 30 percent. That would reduce daily water used by about 5.4 billion gallons, resulting in $113 million dollar–volume savings a day. The AQUS system can reduce metered water usage in a two–person household by about 10 to 20 gallons a day – or approximately 5,000 gallons a year. In addition to conserving water AQUS helps save money in reduced water consumption charges and wastewater treatment or sewer fees.

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This page features our grey water system - the AQUS Toilet Water Conserving System.