The cartridge is suitable for the new Metal Frame Pools ranging from 5.49 to 7.32 meters and Easy Set Pools starting from 5.49 meters, model year 2004. Additionally, the filter 59905 can also be used in all Metal Frame and Easy Set Pools manufactured before 2004, which typically require cartridge 59901 (Krystal Clear 520 and 530), by using the included adapter piece. Filter Cartridge Type B is compatible with Intex pumps 56631, 56632, 58621, and 58622, models 51, 52, 520, 520R, 530, and 530R Krystal Clear filter pumps (1/2 HP pump 7500 + 11355 liters). The cartridge is TÜV certified and has a CE marking.