PACK of 2 Hayward CX760RE Series C751 817-0075NP ALL AMERICAN Cartridge, Unicel C8411, StaRite PosiClear PXC75 25230-0075S, Aladdin 17530, Waterway ProClean 75, Pleatco PA76, Filbur FC-1255 Replacement Swimming Pool Filter Cartridge

THE LENGTH OF TIME A CARTRIDGE LASTS DEPENDS ON SEVERAL FACTORS. THE MOST IMPORTANT IS THE NUMBER OF TIMES CLEANED & HOW, not power washed. In season the cartridge should be cleaned every 4-5 wks. If a lot of debris or algae, the cartridge will need to be cleaned every day until the pool is clear. If not cleaned often the cartridge will collapse. *The swimming season. *The water chemistry. *If the pool is inside a screen. *The number of swimmers, lotions, & pets in the pool, etc. *If the area around the pool is treated for insecticides or fertilized. *Chemicals used to remove phosphates break down the filter media. ALL AMERICAN CARTRIDGES have the industry's only "Anti-Microbial Open Flow Core" that helps prevent algae and bacterial growth & retains structural strength. These cores are the leader in strength & optimal flow.  4 oz Polyester Point Bonded media contains more fibers per square foot than any other media & provides greater dirt holding capacity so your pool gets cleaner faster. Because of  the uniform weave, dirt loads up evenly using more square footage of the cartridge. The water passes through the media easily, using less pressure for a more energy efficient cartridge. The media has a slick feel because the fibers are on the inside to capture the dirt particles there, making the cartridges easily cleaned. When cleaned these fibers release the dirt & you don't have to work as hard to clean; the media will appear grey, but won't affect the filtration. The fibers don't get fuzzy over time extending the life of your cartridge. The point bonds add strength to the media, allowing it to hold up to the chemicals in your pool. The sharp pleats are easier cleaned. The proprietory antimicrobial end caps prevent growth of bacteria and related pathogens.