Please Note: Polyplab does not authorize the resale of Polylab products on Amazon, Chewy or other 3rd party marketplaces. One supplies calcium, magnesium, and alkalinity to your reef in a simple and convenient formula. It is a fully balanced calcium system that does not require complicated reactors, multi-part system or any extra equipment. PolypLab One is engineered from two forms of acetate and hydroxide salts. When dosed, the calcium magnesium ions are freely available for uptake by corals, clams, and many other reef organisms. The acetate ions are metabolized by bacteria to create biologically available biocarbonate. The hydroxide salts provide further buffering capabilities. - Does not elevate salinity. - Does not contain calcium carbonate. - Phosphate and silicate free. Ingredients: Calcium Acetate, Magnesium Acetate, Hydroxide Salts Contains Approximately: 70,000 mg/L Calcium, 16,000 mg/L Magnesium, 4,000 meq/L of Alkalinity