3100 gallon pond with a skimmer and bio falls being pushed by a 4800 gph pondmaster pump. Also running a 2000 gph pondmaster pump going to 2 55 gallon drums one contains spring flow the other skippy pads. After the 55 gallon drums I have a 6000 gallon 40 watt pondmaster uv light. Water is clear and fish are happy....I need to make it bigger in the spring