KH Buffer Please select Size above. Set of 3 contains 1 kg of each element, 1 kg KH buffer - 1 kg Magnesium, 1 kg Calcium + Reef Buffer Carbonate hardness or buffering capacity is the measure of alkalinity in the aquarium water and the ability of the system to prevent pH swings. Over time, carbonate hardness can be depleted, and this additive allows the user to restore the hardness to optimum levels 3g (two thirds of a teaspoon) will raise Alkalinity levels by approximately 1dKH in 100 litres of salt water. Target Alkalinity levels are around 8 to 10 dKH using a good quality, reliable test kit.
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