Apparatus and systems for water collection, catchment, storage, dispersion and distribution; apparatus and systems for water reticulation, water conservation, water filtration, water treatment and purifying, water flushing, water diversion; water tanks, vessels and chambers for collecting, storage, dispersion and distribution of water; and parts, fittings and accessories for all of the aforegoing goods including screens; filters for drinking water, filters for water for domestic and household use, filter socks, filter baskets, sand filters, rain heads, and valves; apparatus for separating leaves or debris from rainwater passing through a downpipe