Sand Filter Pump 3435 GPH high-flow pump filters pools up to 11000 gallons 13 inch tank fits 55 lbs sand or 18 lbs filter balls filter media not included 7 way valve with modes including filter rinse backwash waste recirculate winterize and close 34 HP copper motor with built in overload protection for stable performance Pre filter basket catches large debris with clear lid for quick maintenance How Does a Sand Filter Pump Work? A sand filter pump keeps your pool water clean by filtering out dirt, debris, and other particles. Water from the pool is pumped into the tank, where it passes through a bed of specially graded sand. The sand traps fine particles, allowing clean water to flow back into the pool. Over time, when the sand becomes too full of debris, a simple backwash reverses the flow to flush the dirt out. It’s a low-maintenance, high-efficiency system that delivers sparkling water all season long. Clean Pools Up to 11000 Gallons Enjoy crystal clear water all summer with this 13 inch sand filter pump. Perfect for above ground pools up to 11000 gallons. Easy to use and built for summer fun.