SuperBuffer-dKH, 1kg. 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. 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 your corals as other competing products can! Directions: Dissolve one teaspoon of Superbuffer-dKH in a glass of fresh water. Add directly to tank or sump for each 20-30 gallons (80 liters) of tank capacity each day until the desired pH and alkalinity (carbonate hardness or KH) are reached. Wait 1 hour to remeasure alkalinity, but wait 24 hours for pH to stabilize, before re-measuring (full pH increase and stabilization may take up to 48 hours!). This product is designed for reefs and may be used in fish only marine systems also.