ok, I think we're getting a little confused, this is from RHF
" In an aquarium with an
acceptable pH, there is no concern that the alkalinity provided by limewater is any different from any other carbonate alkalinity supplement. The hydroxide immediately disappears into the bicarbonate/carbonate system. In other words, the amount of hydroxide present in aquarium water is really a function of only pH (regardless of what has been added), and at any pH below 9, it is an insignificant factor in alkalinity tests"
so yes it does add alk, but not relitive to Ca so if you want to raise your Alk but not Ca you can't do it with kalk. and in my case if I wanted to keep my Ca at a NSW level of 380 to 400, but I like an elivated Alk, I needed to run both.
Steve
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