1200 GPH Pond Pump Adjustable Submersible Inline Fountain Waterfall Koi Filter This pump is good for waterfalls, pond filtration systems, or any other pond application. Max Flow Rate: 1200 GPH (4500L/H), H-Max (Lift height): 13 feet, can be used submerged or inline (external), Flow rate is adjustable Ceramic shaft  corrosion resistant in salt water Allow large size of dirt particle up to 1/4" with spiral propeller design Safe for fish  no cooper, no oil