Compatible Replacement for Multi-Flo and Enviro-Guard Systems Submersible, flood-proof design Treats 500-1500 gallons per day (GPD) Non-Clog Impelller Design Quiet, 24-hour operation The MAXAIR500 Submersible Aerator is a direct replacement for Multi-Flo and Enviro-Guard* aerobic septic systems. The MAXAIR500 septic aerator outperforms the competition in terms of aeration and its innovative, non-clog design puts the MAXAIR500 in a class above the rest. For years, septic professionals have trusted the MAXAIR500 as an Enviro-Guard or Multi-Flo aerator replacement for its quality construction, excellent performance, and superior submersible design. The MAXAIR500 treats 500-1500 gallons per day (GPD) making it compatible with ALL Enviro-Guard and Multi-Flo aerators and works in the following systems: Enviro-Guard Model ENV.750, Multi-Flo FTB 0.5 (500 GPD), FTB 0.6 (600 GPD), FTB 0.75 (750 GPD), FTB 1.0 (1000 GPD), FTB 1.5 (1500 GPD). Submersible Aerator AMP 2.7 Voltage 115 Single phase RPM 1725 Unit Weight 32 lbs. Unit Dimensions 25" x 9.5"