Aquamedic Reef Life KH Buffer 1KG. Aquamedic Reef Life KH Buffer is a water supplement for the stabilisation and increase of alkalinity in reef aquariums. Aquamedic Reef Life KH Buffer replenishes the carbonate buffer in reef aquariums and stabilises the carbonate hardness (alkalinity). This product should be used in conjunction with Aquamedic Reef Life Calcium, and it can also be used in combination with Aquamedic Reef Life Trace. Aquamedic Reef Life KH Buffer can be added automatically using the Reefdoser, a dosing-controlled pump. Please refer to the product guidelines for the amounts to use and the optimum frequency of use.