The Pentair R173578 is a 130 SqFt Clean and Clear® Replacement Cartridge Element. Long-lasting Clean & Clear Cartridge Filter with fiberglass-reinforced, chemical resistant, polypropylene tanks. Optimal cycling of the water to trap unwanted debris for a more ideal pool experience. The coreless cartridge can be rinsed clean in minutes with a garden hose. Pool pros love the spin-on unions that provide less effort install. This Element is a genuine Pentair product.