Specially formulated alkalinity or carbonate hardness (KH) builder designed to build the KH of marine reef aquariums. When used as directed, Coral Builder is designed to have only minimal impact on calcium, magnesium or strontium levels unlike other buffers Stabilizes pH and prevents pH drop Coral Builder is the finest buffer available for reef type marine aquariums and is designed to mix clear with little or no cloudiness or precipitation Will not flake on your corals as competing products can! Directions: To raise alkalinity or KH, dissolve one teaspoon of Coral Builder in a glass of fresh waterAdd directly to tank or sump for each 40 gallons (160 liters) of tank capacity each day until the desired alkalinity (carbonate hardness or KH) is reached.