Pharma Soda Ash 1 Gallon Mix (Single Use) - Bulk Reef SupplyUltra pure Grade Soda Ash for 2 part dosing in your reef tank! Bulk Reef Supply 2 part additives are the perfect solution to replenish the intake of calcium and alkalinity coral consumes when it grows. Using only pharmaceutical grade ingredients allows you to keep a cleaner reef with fewer impurities, leading to faster growth and more brilliant coloration of your coral. All BRS additives mix crystal clear and do not leave any nasty residues or brown