Well, I use kalk but not in an ato. I dose from a still reservoir 24/7 at preset dose which appoximates daily top off needs and is is broken up into 150 small increments throughout the day.
The thing about the coil is that it is designed to establish a low oxygen environment which encourages bacteria to use NO3 for oxygen.. In the presence of organic carbon like vinegar or vodka,etc, the bacterial activity could easily create anoxia, no oxygen/no nitrate, which leads to sulfate reducing bacteria taking over . That process produces elemental sulfur, sulfides and toxic hydrogen sulfide gas ; so, if you use one, monitor it closely.
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Tom
Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals.
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