The Indirect-supply system is a versatile solution for various purposes such as toilet flushing, washing machines, irrigation, and outdoor cleaning. Rainwater from the roof is collected and filtered before entering the underground tank. Equipped with a pressure-sensitive pump, the system ensures water is pumped under pressure when a valve is opened and automatically repressurises when the valve is closed. The water is then gravity-fed from a header tank to fulfill household demands. During dry periods, the system intelligently stops pumping rainwater, allowing a floating ball valve inside the header tank to control the top-up of mains water when rainwater levels are insufficient. For garden irrigation, a direct pump pressure supply can be achieved by installing an outside tap connected to the pump.