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SEA-LAB No.28 Replenisher Block is an automatic replenisher block. Sea Lab No. 28 Replenisher Block always works, and cannot be overdosed.
Sea Lab 28 restores and maintains the concentration of calcium, strontium and all trace elements at the same levels found in the sea. This is not a slow-dissolve or time-release product. It dissolves only to replace depleted elements. Sea-Lab 28 is for saltwater aquariums only.
.5 lb jar contains 50 small blocks (add 2-3 blocks per 10 gallons of water)