The pond boss 630-GPH Pond Pump is ideal for use in large ponds up to 600 gal., this ETL listed pump is 30% more efficient than the average pond pump. Among one of the most convenient pumps on the market, this model also allows for variable flow control. This fully submersible pump is able to handle small debris and its epoxy encapsulated construction requires no mechanical parts, which means no harmful oil leakage making it safe for plants and fish. The pump offers maximum durability, whisper quiet operation and effortless maintenance.