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Effective Water Change Calculator

This calculator estimates the combined effect, or "effective" water change, that results from several smaller water changes. Consider, for example, a system where 25% of the water is changed every week. At the end of the month, roughly only 70% of the original water will have been removed rather than 100%.

This calculator can also be used to estimate the effective water change amount of a continuous water change regimen. Simply enter the amount of water changed over one second as the amount of water changed every second for a reasonable approximation.

Total Water Volume:

Water Change Volume:

Water Changed Every:

Calculate Effective Water Change After:

Original Water Left:

Percent New Water:

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