Waterco MultiCyclone 200376 40 SqFt MC12 Plus Cartridge Filter with 1.5" Union 50 psi. MultiCyclone Plus combines centrifugal and cartridge filtration into one streamline housing, creating an ultra-compact filtration system that can be vertically installed on a pool pump. It works on the basis of centrifugal water filtration. No moving parts to wear and tear and no filter media to clean or replace. Incoming water is guided by a diverter generating a strong centrifugal effect. the sediment spins out then spirals down to the sediment sump, while the cleansed water spirals upwards.