The  Grundfos PG is an interconnect device that allows you to save precious drinking water by using your harvested rainwater for toilet and garden applications.

Always prioritizing the use of the rainwater, the PG will automatically switch over to mains water source when your rainwater tank runs low, or during electrical failure.

The pump itslef is only active when the rainwater is being drawn from the tank. It does not operate when the PG has switch to mains water. The pump controller automatically starts and stops the pump when a demand is sensed - for example, flushing a toilet or operating the garden tap.