FritzPro Sodium Carbonate is a pure professional reef supplement ideal for experienced marine/reef aquarists. It can be used on its own or as part of a two-part calcium and alkalinity system to stabilize water chemistry, promote better coral, coralline algae and invertebrate health and growth. Dosage: One teaspoon (5 g) per 65 gallons will raise alkalinity by approximately 1 dKH. Dissolve the appropriate amount in RO/DI water, and slowly add to a high flow area, preferably into the sump. Monitor pH while dosing, and reduce any impact of pH change to more than +/* 0.2. Re-test and repeat dose until desired level is reached. CAUTION: Avoid contact with eyes, skin and clothing. Wash hands after handling. Storage: Store in a cool, dry place with lid tightly sealed and out of reach of children.