This calculator can be used to estimate the amount of additive needed to reach the desired level of a specific element in the water.
Be careful when you use additives, always follow the instructions for the product and test your water on a regular basis.

If you want to read more about dosing Ca, KH and Mg, please visit the help page.

Adjust/maintain parameter

If you are signed in and have registered measurements for a given parameter, then the values will be filled automatically using your latest measurements.

Volume must be a whole number, example: 880

The total amount of water in your aquarium, sump etc.
The water parameter you want to adjust or stabilize.
(Sign in to add your own parameters)
The additive you want to use. Additives which specify g/l are liquid solutions of the additive.
(Sign in to add your own additives)

Value should be a number, example: 7.3

Your latest measurement of the choosen parameter.

Value should be a number, example: 7.3

The value you want to reach for this parameter.
per. day

Value should be a number, example: 3.5. Enter 0 if you don't want to account for daily consumption.

Specify how much your corals, algea etc. consume pr. day. More information on the help page.
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