Calcium Chloride is a highly soluble form of inorganic calcium which makes it ideal for rapidly raising dissolved calcium levels in marine aquaria. It is a very pure anhydrous grade free of phosphate and nitrates. The highly soluble property allows the aquarist to rapidly adjust calcium concentrations to desired levels.
Directions: This product MUST be used in conjunction with a calcium test kit so as not to allow aquarium calcium levels to exceed 450 ppm. Alkalinity should also be closely monitored when using calcium chloride. Excessively high calcium and alkalinity levels can lead to the precipitation of calcium carbonate in an aquarium. When calculating the amount of calcium chloride required, use the following conversion: 1/8 level teaspoon of calcium chloride will add approximately 60 ppm calcium ion to 1 gallon of water. For example, to raise the calcium level of a 55 gallon system by 60 ppm, would require the addition of 7 level teaspoons. ALWAYS mix and dissolve calcium chloride outside of aquarium in cold fresh water using a minimum of 3 fl.oz. of water per teaspoon of calcium chloride. Mix immediately to prevent localized heat, which could melt plastic or crack glass containers, then slowly pour solution into a high current area of aquarium. Keeping alkalinity between 2.5 and 3.0 meq/l, and adding calcium chloride slowly during the time of day when pH is at its lowest, will help prevent precipitation.
Please be aware that Calcium Chloride does not add bicarbonate and carbonate ions to the system. Since most calcifying organisms require these ions in addition to calcium ions, the aquarist should monitor alkalinity frequently when using Calcium Chloride, and make the proper adjustments with a buffer additive. Calcium Chloride can directly reduce alkalinity by elevating the calcium ion concentration to excessively high levels, and thereby initiate the precipitation of calcium carbonate from the water. This may or may not be visibly detectable, depending on the magnitude of precipitation. Excessive use of Calcium Chloride may disrupt the balance of ions in a marine system by the continued addition of chloride ions. We recommend B-Ionic Calcium Buffer or Calcium Hydroxide as better long-term calcium and alkalinity supplements, but Calcium Chloride can be very useful in restoring low calcium ion levels in systems with adequate to high alkalinity levels.