Apparatus and systems for water reticulation, water conservation, water filtration, water treatment and purifying, water flushing, water diversion, water tanks, vessels and chambers for collection, storage, dispersion and distribution of water, namely, first flush water diverters, water filters, screening apparatus for screening debris from water flowing from a roof or through a guttering system, rain heads, water diverters for diverting a flow of water from a roof to a down pipe outlet, screens for water tanks, flap valves for water tanks to prevent ingress of insects into water tanks, mains water supplementary supply and to pump systems for water tanks, tank overflow outlets, safety hatches for water tanks, filters for drinking water, filters for water for domestic and household use, filter socks, filter baskets, sand filters, systems incorporating some or all of the aforesaid goods, excluding irrigation, irrigation products and services, irrigation systems and components therefor, sprinklers, sprinkler systems, irrigation equipment, and the design, installation, and repair of irrigation systems