Forsta filters are fully automatic, and utilize inlet water pressure to hydraulically . A rigid cylinder screen strains particles from a water source, trapping debris on the inside. This layer of buildup causes differential pressure across the inlet and outlet. A controller monitors the filter and opens a flush valve when it senses adequate differential pressure. This creates rapid flow through the internal cleaning apparatus, which vacuums buildup from the screen and expels it. The entire cleaning cycles takes from 6-15 seconds without interrupting the main flow.