This ultra-pure magnesium additive from Bulk Reef Supply is essential for maintaining balanced calcium and alkalinity levels in your reef tank. Designed to prevent excess calcium carbonate precipitation, it ensures a healthy marine environment by keeping the magnesium concentration stable. The product comes as a fine powder that dissolves quickly and clearly without any residues or undissolved salts when mixed with BRS Magnesium Chloride. It is pharmaceutical grade and suitable for bulk purchase, offering significant cost savings in resealable packaging for easy dosing and long-term storage.