Schematic of direct system

This is not intended to accurately represent scale or true designIn this diagram the water from the roof enters the tank via a filter which is designed to flush leaves and other debris away when there is sufficient rain. Excess water overflows to the surface water drain. Water travels to a pump where it is sent under pressure to the toilet cisterns and washing machine.

The tank in this instance could just as easily be underground in which case a submersible pump would be installed within the tank

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