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Old 09/25/2017, 03:08 PM   #16
RC Mod
Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 87,080
Kalk reacts with carbon dioxide to convert OH- into carbonate and eventually bicarbonate. The total alkalinity remains the same, but the pH of the tank will drop with the conversion, thus countering the initial spike due to the Kalkwasser. Air with more carbon dioxide should tend to push the conversion more rapidly.

Jonathan Bertoni
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