Replaces original type A filter cartridges filters up to 3 micro particle size Lasts 3-4 times longer than a standard type a filter cartridge High dirt absorbing Washable and reusable Aqualoon is a unique, filter media swimming pool filter cartridge which can carry dirt particles as small as 1 micron out of filters. Aqualoon polyethylene balls are much easier to use and maintain than normal filter sand or filter lens. This set will replace your traditional paper A/C cartridge for your above ground pool such as Intex or Summer Waves