The Polaris Leaf Trapper main drain system uses the force of clean, filtered water to clear dirt and debris from swimming pools and spas. Using suction created by a high-pressure venturi nozzle inside the canister, the LeafTrapper pulls leaves and debris from the pool bottom through a plumbing line connected to the main drain. Clean water is returned to the pool through a specialized fitting that directs flow to improve pool skimmer efficiency.