Greywater (also spelled graywater) is waste-water collected from
household showers, sinks, tubs and washing machines that would
otherwise be sent down the drain and into the sewage system. IT
IS NOT FRESH WATER. It is also not potable water and can pose a
public health concern if abused, but can be used for some
household activities such as flushing toilets and, more
commonly, for irrigation. Greywater differs from “blackwater”
that too is not potable water, which is water that has come into
contact with fecal matter or people who carry infectious
diseases. Again, neither one is considered potable water and can
be a public health concern if not used correctly. There are two
main classifications for greywater: - Untreated greywater is
collected relatively cheaply and is always used immediately. It
may be utilized for flushing toilets or for outdoor irrigation,
where it is then purified by plant roots and soil life. -
Treated greywater is collected using automated diversion,
purification, and irrigation systems