Pond Pump Sizing Calculator

Calculate the required flow rate (GPH) to maintain a healthy ecosystem.

Pond Details

Pond Volume (Gallons)

Stocking Level

Flow Recommendation

Required Output1,000GPH

Turnover Rate1x/ hr

Required Flow (GPH) vs Pond Volume

Important: This is the flow required AT THE FILTER height. Head pressure reduces pump output significantly!

Recommended minimum flow rate for filtration.

Pump and Filtration

The heart of any pond is its pump. It circulates water through the filter, ensures waste is processed, and aerates the water. The key metric is the 'turnover rate'—how often the entire pond volume passes through the filter.

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Pro Tips

Head Pressure: Friction from pipes and lifting water up a waterfall ('Head Height') reduces flow. Buying a pump rated for 2000 GPH might only give you 1000 GPH at 5ft of lift.
Solids Handling: For ponds with fish, ensure the pump can pass 'solids' (waste/debris) without clogging, or use a skimmer.
UV Clarifiers: Ensure your flow rate matches your UV light's limit. Too fast, and the UV won't kill the algae.
Energy: Pumps run 24/7. A high-efficiency pump can save hundreds of dollars a year compared to a cheaper, inefficient model.

Fun Facts

"The first screw pump was designed by Archimedes in 200 BC and the design is still used today!"
"Koi produce massive amounts of ammonia. A heavy koi pond needs to turn over its entire volume 1.5 times every hour."
"Stagnant water acts as a breeding ground for mosquitoes and harmful anaerobic bacteria."

Formula: Flow (GPH) = Volume × Turnover Rate

Used with this

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