Safe and easy-to-use buffering compound for marine aquariumsBuffers pH and provides a constant supply of vital calciumReplenishes all 15 essential trace elements found in natural seawaterNaturally occurring buffer compounds maintain ideal saltwater chemistry. Eliminates major water quality problems and limits phosphate, ammonia, and heavy metals. Also buffers pH and provides a constant supply of vital calcium, as well as all other essential trace elements and microelements. Dissolves slowly for gradual change - no possibility of harmful overdose. 1/2 lb jar - 50 blocks (add 2-3 blocks per 10 gallons of water); 2 lb box - 24 large blocks (3-4 blocks per 50 gallons); 2.2 lbs block - treats 100+ gallons. For saltwater only.Please click on "More Information" for instructions for use.

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