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Steve, it is the cholride ions. I've bought Kalk to buffer my calcium levels for the long term and it seems to be working well.
Another note, Kent defended their product by claiming that sea water contains 20,000 ppm of chloride ions anyways, though they wouldn't tell me the concentration of turbo calcium so I can't compare.
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THE BARQUARIUM:
55 gallon cube - 50 lbs LR - ASM G3 skimmer - 30 Gallon sump - 22 Gallon refugium / frag tank - 4x 24 watt HO T5's - Mag 9.5 return - Pin Point PH monitor - 400 watt XM 20K MH in Lumenarc reflector - Dual stage GFO/NO3 media reactor - 6 stage RODI auto top up -Wavemaster Pro running 3 Koralia 2's.
Fully stocked with fish, corals and usually some fine scotch
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