The new range of fluval u series underwater filters replace the plus rangethese clever filters feature more filtration capacity and are more adaptable and are easier to use and clean than the existing plus ranger all filters feature flip top access for quick and easy cartridge replacementr the u2 u4 models feature three stage filtration for superior aquarium water quality and three way flow control with integrated spray bar for versatile water circulationr features r for aquariums from 90