1 Pcs For Bestway Replacement Filter Cartridge Swimming Pool Pump Easy Set Up Feature 100 brand new and high quality Convenient to use, hand held tools. Material silicone This Bestway filter cartridge will fit 300/330 gal/hr filter pump systems. Filter Cartridges fit inside your Filter Pump and catch dirt as it passes through the system. Bestway suggests that you replace the Filter Cartridge every two weeks in the summer to keep the swimming water clean. Bestway