As water enters the cleaning valve, the top impeller spins the gear assembly around the housing. As the gears turn, the Lower Cam lifts one of the six 2″ T-Valves to allow water to escape through one of the ports and out through the cleaning heads. The pop up cleaning heads spray dirt and debris to the main drain and skimmer to be trapped and filtered out before returning to the pool. As the gears rotate and lift each T-Valve a new zone of pop ups is activated, providing a thorough sweep of the pool.