Reef Endurance Bulk Magnesium Chloride, 3lbsPharmaceutical-Grade Magnesium Sulfate Aquarium SupplementReef Endurance Magnesium Chloride is a pharmaceutical-based aquarium supplement that mixes crystal clear with no unwanted impurities. Maintaining a proper magnesium level of 1200-1350ppm in reef aquaria helps achieve the essential balance of calcium and alkalinity in the aquarium by preventing excess calcium carbonate precipitation. For best results, use Reef EnduranceMagnesium Chloridefor complete balance.Replenish and maintain Magnesium levels in a reef aquariumResealable PackagingMixes ClearNo ResidueStock Solution Mixing Instructions:1gal RO/DI + 1181.25 grams (about 5.25 cups) of Magnesium Chloride + 378 grams (about 2 cups) of Magnesium SulfateFill a one-gallon container half full of RO/DI or distilled waterAdd 1181.25 grams (about 5.25 cups) of Magnesium Chloride and 378 grams (about 2 cups) ofMagnesium Sulfateto the container.Fill the remaining volume of the container with RO/DI or distilled water, then secure the cap.Shake vigorously and allow to dissolve for 24 hours altogether.TIP: A precipitate (calcium sulfate) will form, which is normal. Adding this to the aquarium will not cause any problems.Dosing Instructions:1 mL of Magnesium Chloride stock solution will raise magnesium by approximately 14 ppm in 1 USG. Increasing magnesium by more than 50 ppm per day is not recommended.Tip:If you have issues raising your alkalinity levels, ensure your aquarium magnesium level is between 1200 and 1350 ppm.