Graywater Filtration

Greywater System

All OTechnology designs offer greywater reuse systems to reduce demand on conventional water supplies and pressure on sewage treatment systems. Greywater is untreated household waste water that has not come into contact with toilet waste.

Greywater includes used water from bathtubs, showers, bathroom wash basins, and water from clothes washing machines and laundry tubs. It does not include wastewater from kitchen sinks, dishwashers, or laundry water from soiled diapers. Greywater is available year round and can provide water for landscaping even during drought times.

Environmental Benefits

Greywater use conserves precious fresh water. More than 60% of domestic water can be recovered or reused.  It reduces the flow of wastewater entering sewer or septic systems and supports plant growth without using expensive potable water. Sometimes, greywater is actually better (more nutritious) for your garden: greywater use has been shown to increase olive tree yields by more than 20%.

In the United States, groundwater provides much of the nation’s public and domestic water supply, supports agricultural and industrial economies, and contributes flow to rivers, lakes, and wetlands. About 40% of the nation’s public water supply is from groundwater, and more than 40 million people, including most of the rural population, obtain drinking water from domestic (private) wells. Many groundwater sources are decreasing due to climate changes and droughts.  When greywater is applied outdoors, it helps solve this problem by recharging groundwater levels.

Health and / or Social Benefits

Greywater use reduces the amount of potable, fresh water used by households. When the weather is warm, about half of the water consumed by the average household in North America is for outdoor use. Capturing the indoor greywater for use outdoors can cut water usage in half. The World Bank reports that 80 countries now have water shortages that threaten health and economies while 40% of the world—more than two billion people—have no access to clean water or sanitation.

Economic Benefits

In addition to conserving water and probably reducing your water and sewer bills, you will also be “drought-proofing” your landscape by using greywater. Since more than half of your indoor water can be reused as greywater, during shortages, when outdoor watering may be restricted, you will have a continuous source of water. With landscapes valued at between 5% and 10% of the value of a home, this back-up supply of water may be an important economic insurance policy for you. A family of six people can recover more than 200 liters of greywater every day.