Anjon Mfg Monsoon MS-6100 - 6,100 GPH Submersible Pond Pump High flow, energy efficient hybrid drive technology combines the high flow characteristics of a direct drive pump with the energy saving efficiency of a mag drive pump Asynchronous drive motor can be controlled with variable speed controller (not included) that permits you to increase or decrease pump flow as needed Impeller passes solids to .25. Engineered for 24-hour continuous use; overload sensor prevents burnout Contains no oil; completely safe for fish, wildlife and aquatic plants 2-year manufacturers warranty: (The speed controller does NOT work with the MS10000, MS12500--(these two 30 foot cord models), (MS3000100, MS5200100, MS6100100, MS80001000, MS10000100, MS8000200, MS12500200, MS15000200--all 100 foot cord models)).