Highly-effective alkalinity-increasing (""buffer"") powdered blend, Helps increase pH stability in an aquarium by raising the alkalinity; continued addition raises pH until 8, 3 is reached, at which point the pH remains unchanged and the alkalinity alone increases, Provides a source of carbonates, which make up the majority by weight of aragonite, the mineral secreted by reef-building organisms as skeletal material, Formulated by a marine scientist, Powder, 500-g, SKU: RYLHC1043