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Backwash Water Loss Calculator

Gallons per backwash cycle and per month from filter GPM, minutes, and frequency, plus water cost.

Inputs

Inputs and assumptions

Filter flow rate from the gauge or pump curve.

Minutes per backwash cycle, usually 2-3.

Backwash cycles per month, usually 1-4.

From your water bill, per 1,000 gallons.

Result

Gallons per month (gal)
600
Monthly water cost (USD)
$3.60
Gallons per backwash (gal)
150
Planning estimate, not a quote. Rates, soil, access, and local rules move real prices — confirm with itemized quotes.

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Guides

01 How to Measure Pool Volume: Dimensions, Depth, and Gallons 02 Evaporation and Pool Covers: Calculate Water Loss and Savings

Related articles

01 Evaporation and Pool Covers: Calculate Water Loss and Savings 02 How to Measure Pool Volume: Dimensions, Depth, and Gallons

Workspace

Keep the assumptions with the result.

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