what are grey-water systems and how do they work?
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Gray water is wastewater without fecal contamination so wastewater from sinks, showers, washing machines etc. Water with fecal contamination is called black water, that is from your toilet.
If you have a separate system for gray and blackwater you can with minimal or no treatment reuse it for non-potable uses, so not for drinking, cooking, cleaning clothes, and dishes. But you can use it to flush toilets, irrigate your garden, crops etc.
Graywater can contain a small amount of fecal contamination laundering or showering so you applying the water below the surface is better the spaying it where you can get aerosols that can be breathed in. A drip line under the topsoil is one way.
If you reuse greywater you should take care so what you use in cleaning stuff that gets into the system is not something that is bad for plane at the level of cleaning you do.
So greywater system is a system to reuse water that otherwise would be in the sewer line with black water. It can have a major impact on required potable water usage.
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