Deltec Fleece FilterThe VF Series Fleece Filter can be used in freshwater or saltwater aquariums. Unlike the competition using 20 micron fleece material the VF Series Fleece Filter uses 50 micron fleece rolls to decrease replacement interval Features Fully assembled and ready to use Effortless roll change design Auto shut off motor Emergency overflow High Flow Rate Gearless operation The motor is fixed and not able to move = more stability Ability to be hung in the sump