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Steve, it is the cholride ions. I've bought Kalk to buffer my calcium levels for the long term and it seems to be working well.

Another note, Kent defended their product by claiming that sea water contains 20,000 ppm of chloride ions anyways, though they wouldn't tell me the concentration of turbo calcium so I can't compare.

Remember, kalk is a balanced supplement... calcium AND alk... :smile:

I don't think I will agree with that, in my experences I still have to add Alk to my tank when I use Kalk. so I don't think it is as ballanced as people thing, but rather leans heavaly towards the Ca replacment side.

Steve

Well allrighty Steve :biggrin: ... I stand somewhat corrected... I meant balanced in that both are added at once... though your consumption will of course vary from tank to tank. :question: