What is Greywater?

Greywater is gently used water from your bathroom sinks, showers, tubs, and washing machines. It is not water that has come into contact with feces, either from the toilet or from washing diapers. Greywater may contain traces of dirt, food, grease, hair, and certain household cleaning products.

Greywater-systemBenefits of reuse

Demand on conventional water supplies and pressure on sewage treatment systems is reduced by the use of greywater. Re-using greywater also reduces the volume of sewage effluent entering watercourses which can be ecologically beneficial. In times of drought, especially in urban areas, greywater use in gardens or toilet systems helps to achieve some of the goals of ecologically sustainable development.

The potential ecological benefits of greywater recycling include:

  • Reduced freshwater extraction from rivers and aquifers
  • Less impact from septic tank and treatment plant infrastructure
  • Reduced energy use and chemical pollution from treatment
  • Groundwater recharge
  • Reclamation of nutrients
  • Greater quality of surface and ground water when preserved by the natural purification in the top layers of soil than generated water treatment processes

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How it Works

greywater-3-way-valveWe design and install residential and commercial greywater irrigation systems and teach how to use them. Our systems are generally simple and low-maintenance, relying on gravity and natural processes to save water and turn your home into an essential part of a healthy ecosystem.

A basic filter package consists of a surge tank that can stand alone or be buried, a bolt-on lid that can be sealed and walked on, water-proof grommets, wastewater backflow valve, heavy-duty high pressure submersible pump, float switch, and bag filter.

More advanced filter packages also have an outdoor-rated fiberglass sand filter system that can be fully automated, with a fresh water valve to backwash the filter vessel, a pressure-reduced valve to provide supplemental irrigation when needed, and a reduced pressure principle device to protect the fresh water supply from a reverse flow of greywater.

Larger automated filter systems for multi-family and commercial buildings are also available. Filter systems deliver filtered greywater to a subsurface drip irrigation network.

Filter and irrigation operations can be controlled. Controllers start when water is available, sends water out to irrigation as programmed, and stops when the tank empties, holding its place in the program until more water becomes available. This process keeps the water fresh and full of oxygen, which is good for the filter, irrigation infrastructure, and plants.

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