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Effect of Water Changes Calculator

This calculator shows how the concentration of a given substance falls or rises with repeated water changes. It can be used for substances that you are trying to remove (such as nitrate) or substances that you are trying to add (such as calcium).

Total Water Volume:

Water Change Volume:

Number of Water Changes:
 (Max 50)

Initial Concentration:

Accumulation Between Water Changes*:

* Enter the rise (+) or drop (-) in concentration of the substance that occurs in the system between water changes.

Concentration in Make-Up Water*:

* Enter the concentration of the substance in your make-up water. For example, 0 for nitrate or 400 for calcium.


* Check this box if the first water change will be performed immediately, before any further accumulation of the substance.

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