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Tunze Calcium carbonate 5L (rec retail $67.95)

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5 liter (1.3 USgal.) bucket.

Calcium carbonate is 99% pure...

CaCO3 (lime) with a grain size of 4 to 6 mm (.15" to .23"). It is ideally suited for use in TUNZE® Calcium Automat and other makes of Calcium reactor for buffering the pH value as well as increasing the calcium content.