Compatibility: All type B Intex pool filters such as model 29005E and Krystal Clear Models : FP621R, 520R, 633, 520, 51, 59901e, 59905E; 56611, 56621, 58621 56633, 56631, 58621, CS8221/CS8231, CS8111, 634RC, 634T, 633 NOTE: All names and part numbers are for reference only Superior Filtration: Meltbown technology allows for superior filtration over the standard pleated material used in most pool and spas, meltblown filters also keep the debris locked into the material, keeping your pool cleaner without the use of heavy chemicals. Perfect Fit: Our type B pool replacment filters measure 10” x 5.75”. You will get 3 premium type B pool filters and excellent after-sales service. 100% Made and Sourced In America No More Cleaning: No more washing off the outside of the filter, metlblown filters last much longer than the standard pleated filter. It is also recyclable. Melt blown pool filter replacement for Intex type B pools, longer lasting than a standard pleated filter. Melt blown filters are much more efficient than a pleated filter this allows the filter to catch more particles, keeping your pool cleaner without the use of adding as much chemicals as you would typically need to use. Melt blown filters also have much more surface area than a pleated pool filter meaning it can capture 3 to 4 times more debris on average.