I've been adding kalk to my ato for about a year now and I think it's one of the best things I could have done for my tank. I've been adding 1 tspn per gal with good success. I also run a calcium reactor but it's not always consistent on it's own. With the kalk I don't have to worry about the reactor slowing down now and again. No special technique here, I just toss the kalk in every time I fill the ato reservoir. No pump clogging here either.
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-Mason
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