eight.four(tm) supplies a properly balanced (carbonate/bicarbonate) buffer system that yields an industry leading pK of 8.6 which makes pH maintenance of 8.3 8.5 easy. A higher pK increases the buffer's ability to counteract inevitable acidic sources in the water. eight.four(tm) will safely raise marine pH while adjusting alkalinity. eight.four(tm) contains a concentrated, balanced blend of bicarbonate and carbonate salts designed to restore disrupted buffer systems and increase carbonate alkalinity.