How Big of a Pond Pump Size Do I Need?


Pond pumps help to keep the oxygen at a healthy level in the water. The proper oxygen levels will vary according to whether your are trying to sustain fish and plants in your pond.


  • Ideally, your pond pump should be large enough to circulate all of the water in the pond at least once every two hours. This is the pump's maximum output. Manufacturers label output data as gallons per hour (gph).


  • Manufacturers rate pumps by their ability to lift water into the air, as in a fountain effect. The rating measures how many vertical feet the pump can push water above the surface of the water. Choose a pump with a higher number when you want the pump to push the water higher into the air.


  • Factor both the measurement for gallons circulated per hour and how much water the pump sends into the air simultaneously when selecting a pump. In general, circulation decreases as the lift increases.


  • Choose a pump that meets your needs. If you choose too small of a pump, you risk not circulating enough water. If you choose too large of a pump, you waste energy, produce excessive noise and risk pumping the water out of the pond.

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