The free AquaCalculator side stands for relevant calculations and pelvic documentation in the marine hobby. From the salt concentration to managing maintenance dates was thought of everything. AquaCalculator - Features at a glance: ■ logging of all the relevant water parameters ■ calendar function to remind you of important maintenance dates of your aquarium ■ Comfortable salt quantity calculating and salt-conversions (including concentrations of Ca / Mg and Alkalinitätsdaten and the yield of the most salt mixtures available.) ■ Extensive computer for adjustment, correction and maintenance of the Ca / Mg concentration and alkalinity by inexpensive chemicals ■ stores data from up to 50 different aquariums