Oceamo DUO is a system for the simple and effective supply of seawater aquaria with calcium and alkalinity (KH), the most important building blocks for the growth of hard corals in reef aquaria.

Additional to Ca and KH, DUO also provides the important elements potassium, strontium, boron, magnesium, bromide, sulphate and the trace elements rubidium, iodine, selenium and fluoride to create an optimum aquarium environment for healthy growth.