The filter cartridges type B filter out any contamination from the pool water that comes into the cartridge when the filter pump is sucked in. The filter cartridge can be cleaned with the garden hose. A replacement cycle of up to 2 weeks is recommended, depending on the frequency of use of the pool and the location. The individually available cartridges provide with high filter resolution for crystal clear pool water. For all Intex filter systems with B cartridge (28634GS). This text is machine translated.