Large = 6 oz. For systems with 50 - 100 gallons of water. Replace every 6 months. These buffer bags will help create and maintain a buffer in your aquaponics system. Simply place the bag in your fish or sump tank. Combination of calcite and aragonite to support proper pH and trace element composition. Uniform particle size promotes healthy biological activity. Calcium Carbonate. Comes in nylon bag. On the OMRI list of acceptable products for organic production.
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