The best not only because it's the most concentrated Calcium Chloride (see the numbers for yourself compared to other brands), but also because it contains the right balance of Magnesium and Strontium that is REQUIRED sufficient for absorption by coral calcium. It is also balanced and designed for use as a reef carbonate dosing system. I first started using it over ten years ago and will continue to do so as long as I use the two component dosing system.
Omega-3 caps, 1000 mg, 100 pcs, 1 pack, neutral
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