Bulk Reef Supply's Pharma Soda Ash is an ultra-pure alkalinity additive designed for saltwater reef tanks. This product helps maintain the optimal pH and water chemistry necessary for coral growth and health by providing a reliable source of alkalinity without introducing impurities or residues that could harm your aquarium inhabitants. Each 27-pound bag allows you to create over 30 gallons of liquid alkalinity solution, offering an economical way to manage alkaline levels in large tanks. The soda ash mixes quickly with water to form a clear solution free from any unwanted residue, making it easy and convenient for dosing.