One of the most important elements of operating a healthy and successful reef aquarium is balance. Seachem Reef Buffer is a top of the line marine additive that has been scientifically designed to carefully balance sensitive marine aquariums by raising the pH level to an optimal 8.3 without overdosing, while raising carbonate alkalinity at the same time. Reef Buffer is composed of a blend of carbonate and bicarbonate salts which results in the formula yielding a pK of roughly 8.6 in saltwater.