Reef Endurance Bulk Calcium Chloride, 30lbsPharmaceutical-Grade Calcium Chloride Aquarium SupplementReef Endurance Calcium Chloride is a pharmaceutical-based aquarium supplement that mixes crystal clear with no unwanted impurities. Maintaining calcium within a range of 412-450ppm in reef aquaria will enable corals and other reef-building invertebrates to proliferate. For best results, use in conjunction with Reef EnduranceSodium bicarbonateorSoda Ashas a two-part balanced regimen.Replenish and maintain Calcium levels in a reef aquariumResealable PackagingMixes ClearNo ResidueEasy 2-Part DosingStock Solution Mixing Instructions:One liter ofRO/DI + 0.105 kg (105 g) of Calcium Chloride will create a stock solution with a calcium concentration of 105 g/L.Fill a one-liter container half full of RO/DI or distilled waterAdd 0.105 kg (105 grams) of Calcium Chloride to the container with water.Top off to the 1-liter mark and secure the cap.Shake the solution vigorously and allow it to dissolve for 24 hours altogether.Tip: To ensure all calcium chloride dissolves, raise the water temperature to 77F (25C) and mix for 24 hours. Note:As an alternative, add three tablespoons ofMagnesium Chlorideto help maintain magnesium levels.Dosing Instructions:1 mL of Calcium Chloride stock solution will raise calcium by approximately 10 ppm in 1 USG. Increasing calcium by more than 50 ppm per day is not recommended.Tip:If you have issues raising your calcium levels, ensure your aquarium magnesium level is between 1200 and 1350 ppm.