Doug, I only use a Ca reactor. Once in a while I'll drip kalk in my topoff, but not for any particular reason. I can tell you, I will not be using a kalk reactor...ever. It's just more junk to stuff under my stand, and I don't need to hassle of filling and cleaning it. My Ca reactor maintains all my levels just fine....if I need to adjust for some reason, I use powders.
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Brad
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