Kent Marine Superbuffer-dKH is a specially formulated pH buffer and alkalinity or carbonate hardness (KH) builder, designed to adjust the pH of saltwater aquariums to the range of 8.0 to 8.3 and build the KH. Stabilizes pH and prevents pH drop. Superbuffer-dKH is the finest buffer available for either fish only or reef type marine aquariums and is designed to mix clear with little or no cloudiness or precipitation. Will not flake on corals and works well in brackish water. Shipping weight: 3/4 lb.