If KH2PO4 added 1.86 g to a 50ml container I would get PO4 0.42ppm, K 0.54ppm. KNO3 12.23g I would get NO3 7.5ppm, N 1.69ppm, K 4.73ppm. K2SO4 4.97g I would get K 2. 23ppm, S 0. 91ppm. MgSO4 * 7H2O 50.7g I would get Mg 5ppm, S 6.6ppm, dGH 1.15. So each salt in a 50ml container. I calculated this to dose 1ml per 20l aquarium. The question is the following, if I combined all four solutions into one, I would get 200 ml of solution. The question is as follows. How many ml of this combined solution should be dosed for 20 l of aquarium according to the EI system. Please help me and thanks in advance.