The Indirect-supply system collects rainwater for toilets, washing machines, irrigation, and outdoor cleaning. It uses a filter and a pressure-sensitive pump in an underground tank. When a valve is opened, water is pumped under pressure and gravity-fed from a header tank to fulfill water demands. The system automatically switches to mains water when rainwater is insufficient, and a floating ball valve controls the top-up. For garden irrigation, an outside tap can be connected directly to the pump for pump pressure supply.