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Work out exactly how much water to replace and see the estimated effect on your water parameters.
Between 0 and 100
e.g. current nitrate in mg/L
e.g. nitrate in your tap water
Enter your tank volume and change percentage to see how much water to replace.
Parameter estimates are calculated from a simple dilution model. They do not replace real test kits — always verify your water with a reliable test kit after a water change.