Eheim Professionel 3e Canister Filter is a complete external filtration system for freshwater or saltwater fish-only aquariums up to 105 gallons. In addition to the usual Eheim lock clamps, self primer, shut-off valves for hoses, multiple media baskets, the Eheim Professionel 3e Canister Filter features an exciting new electronic touch pad control system that offers the following options:Output Flow Control, 6 adjustable levels and 1 MAX flow settingConstant Flow Rate, when set at one of the 6 adjustable levels, the electronic controls monitor the flow rate and adjust the output to maintain a constant flow rateBio stream function, will alternate two different flow levels for wave function providing a more natural environment12 hour Bio function, will alternate two different flow rates in 12 hour cycles. For planted aquariums, we recommend having a higher flow rate at night to help oxygenate the water.Service indicator will monitor the cleaning cycle and indicate the time remaining until the next cleaningAuto air out, electronic program will eliminate any air that accumulates under the motor headElectronic error management indicates any irregularities and attempts to rectify the problemOther Features:Max tank size: 105 gallonsGPH: 77-220Media Trays: 3Volume: 6.6LHead Height: 7.9"Dimensions: 10-1/2" x 10-1/2" x 18-3/4"