Check the listing for details. Red Sea Foundation ABC Supplements Complete Pack KH/Alkalinity Calcium Magnesium. Condition: New. Listed at 64.99 USD. Red Sea Foundation ABC Supplements Complete Pack Calcium+, KH/Alkalinity, Magnesium.Red Sea’s Foundation Supplements Complete Pack contains all of the essential foundation elements required in order for corals to thrive within the reef aquarium.Unlike the natural reef where there is an immense reservoir of foundation elements, in an aquarium these elements are constantly depleted due to coralgrowth and other biological activities. Therefore, calcium, carbonates (alkalinity) and magnesium require regular testing and supplementing.For best results, dose according to a measured uptake of Calcium, KH/Alkalinity, and Magnesium using Red Sea’s Foundation Pro multi test kit.The Foundation Supplements Complete Pack is part of Red Sea’s complete Reef Care Program, which provides all of the supplements, test kits and coral foods required to maintain a successful and healthy coral reef aquarium. Concentration: 1 ml will raise the Ca level of 100 liters (25 gal) by 2 ppm.1 ml will raise the Alkalinity of 100 liters (25 gal) by 0.036 meq/l (0.1 dKH)1 ml will raise the Mg level of 100 liters (25 gal) by 1 ppm. Package Size/Volume: 3 x 500 ml (3 x 16.9 fl.oz)