Domestic water usage continues to place higher demand on municipal water supplies and increase costs for consumers. In water-stressed areas, recycled grey water can be a practical source of water for toilet flushing, irrigation, and wash water.

Grey water usually refers to wastewater from residential bathroom sinks, showers, bathtubs, and washing machines, excluding any water that has come into contact with feces. It is ideally suited for newly built developments where dual drainage systems can be designed at an early stage, allowing grey water to be collected and treated separately from black water.

The use of treated and recycled grey water within a development requires a separate and dedicated water network.