Seems like a pain to turn a kalk drip on/off. If you're pumping it, then a light timer would work, I suppose.
I would bet that only a steady drip of half strength kalk won't affect pH much, especially if the tank has proper aeration. I would also bet that most people using kalk just let it go all day every day.
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Pat
Current Tank Info: 125 in-wall , 40b sump. 6 bulb T5. ASM G2 skimmer. LPS and leathers
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