Regular checks of the most important water values are essential for marine fishkeeping, because many organisms, particularly in marine water, react sensitively to fluctuating water values. Precipitations, consumption by the animals, as well as biochemical and oxidation processes affect the constantly changing chemism (that is, the chemical conversion processes in their entirety). The concentration of the main elements calcium and magnesium in particular constantly changes in the aquarium because they are consumed by corals and coralline algae or reduced by precipitations. A regular analysis of water values helps to prevent a deficiency of these elements and monitors the correct ratio of the two elements relative to one another. DuplaMarin offers an extensive analytics system meeting laboratory standards that allows the discriminating fishkeeper to carry out precise and reliable analyses of his water values.