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Old 01/02/2008, 10:23 AM
DocG DocG is offline
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Join Date: Oct 2002
Location: Sarnia, Ontario
Posts: 510
On a large tank with a high calcium demand the kalkwasser is going to have a very insignificant effect on your Ca and alkalinity. The only reason to dose it in a larger system is to keep the pH up. It does a fairly reasonable job doing this.

Without kalk my pH swing is from 7.75 to 8.0

With kalk my pH swing is from 7.95 to 8.12