Naturally 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.
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