The grey water from the upstairs shower and bath is intercepted by an inverted funnel into an inspection port in the drainage pipes. This water is collected in a tank below and then released into a system incorporating three preformed plastic drainage/sump baskets.
The idea was to imitate a homemade charcoal water filter that I read about. The first basket contains a layer of large lumps of charcoal, the second contains small aggregate type stones and the third contains large grained river sand. They are angled so that the water reticulates downwards. The idea is that by the time water passes through the system is will have been filtered enough to enter a larger 'wild-life' pond and bath down slope.
Frogs spawn in all three baskets and also in the pond and bath, so I am more than confident that it works.
Article posted by : Susan
