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Why you should use pond pumps and not sump pumps in garden ponds

Ponds need constant, 24 hour water circulation with filtration which can range from a simple block pre-filter for small ponds to a large external biological filter for the bigger ponds. It is essential that the filter is overpowered by the pump.

They cost more to run

Pond pumps are designed to pump water at low pressure and use minimum power.

For example, a pond pump pumping 15,000 litres per hour uses 250 watts of power, while a high pressure head pump at the same volume uses 700 watts, an increase of 450 watts, an approximate cost increase of $742.50 annually.

Running time

Pond pumps are designed to run 24 hours a day, 7 days a week, i.e. a 100% duty cycle. A typical sump pump is designed to pump a large volume of water in a short time, generally about a 10% duty cycle i.e. 6 minutes per hour.

Could damage your filter

Pond biological filter systems have a maximum pressure of 4m to 6m (0.4 to 0.6 bar). Sump pumps will develop pressures of 10m or more (1 bar or more).  This pressure will cause the filter to leak or burst.