Hi Mary,   As had been ...

Hi Mary,

As had been stated above concerning a sand filter, I think the media used is important and the ultimate discharge into the environment. The gray-water has a great resource capability to hydrate the outer landscape. A simple system can initially collect the water in basins with a preliminary "grease trap" and then infiltrate media for the different stages of water treatment. Ultimately this land surrounding the residential area could be your gated with such water for foo productions a perennial entry crops. Dividing up the households into districts also reduces the size of initial systems and may provide and easier management strategy as opposed to one large System needing to deal with the variable volume. I would advise many scaled Systems depending upon the size of your residential districts, and making them site specific as to their design.