Three KleenWater brand KW4510SW string wound 20 micron water filters - 4.5 x 10 inch. These replacement cartridges are an ideal choice for the value conscious consumer. Performance is commensurate to the competition at a fraction of the cost. Proudly made in the U.S.A. <br /> <br />The KW4510SW is manufactured from a durable polypropylene cord that is wound around a rigid polypropylene core. The large exposed surface area gives this cartridge impressive dirt-loading capacity. Thus it can perform longer and more efficiently. The cartridge effectively removes dirt, rust and sediment down to 20 micron nominal. The 20 gallon per minute flow rates allow for residential, commercial and industrial applications. These cartridges have an industry universal dimension of 4.5 inch x 10 inch. KleenWater is a trademark of Pavel Water Filtration. Compatible with filter housing manufacturers such as Aqua-Pure, Pentek, GE (GXWH35F, GXH30C, GXWH40L), Whirlpool (WHKF-DWHBB), Cuno(AP801), Sears/Kenmore(38448), Culligan(Big Blue) and Ametek (Big Blue), among others.