I add some every 2 weeks (which is where there starts to be very little undissolved at the bottom of the reactor), and I usually add 2 TBSP at a time... This is for my size and evap rate.
Since KALK will only get soooo saturated, it's not too bad to have too much in there (naturally to the point where you have toooooo much in the reactor that undissolved bits start flowing into the tank, which is clearly not good  )
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Single System Setup: 210G SPS reef, 225G FOWLR, 72G water change, 50G frag, 120G sump. I promise a journal at some point! (anyone need some coral frags? I likely always have stuff that is frag-ready)
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