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Water Change Planner & Chemistry Predictor

Predict your reef's chemistry shifts with our Water Change Calculator. Easily calculate how a water change will impact Nitrates, Salinity, Alkalinity, and the 'Big Three' minerals. Start safely and maintain stability!

Total tank volume (gallons)

Water change amount (gallons)

Parameters

Current nitrate level

New water nitrate level

Current alkalinity level

New water alkalinity level

Current salinity level

New water salinity level

Current calcium level

New water calcium level

Current magnesium level

New water magnesium level

Current phosphate level

New water phosphate level

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