Reef Calcium is specifically designed to supplement the reef aquarium with readily bio-available calcium. It promotes the growth of captive corals without the usual problems of chalk formation and depleted alkalinity. Reef Calcium is a concentrated (50,000 mg/L) biologically available polygluconate complexed calcium intended to maintain calcium in the reef aquarium without altering pH. Delivers 175 times more calcium than Kalkwasser. 250 ml treats up to 1,000 gallons.
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