When aragonite elements are low in concentration, corals may develop brittle calcite which leads to lower bone density.This product must be used alongside our Reef Essential Aragonite B & Reef Essential Aragonite C supplements as together they will provide the required major, minor and trace aragonite elements.Recommended calcium concentration = 405-440ppm.Contents: Deionised water Calcium, Strontium & Barium Instructions:Shaking is not required, however, if product has been left standing for a length of time invert bottle 3-4 times before using.Directions:Add product to high water flow. This product must be used in reef aquariums and can be used on a dosing pump.Dosing:Lightly stocked = 0.50mL/100L per dayModerately stocked = 0.75mL/100L per dayHeavily stocked = 1.00mL/100L per dayOr as required to maintain calcium between 405-440ppm.Note: 1mL/100L will raise calcium by 2ppm, other elements will increase relatively.