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Hi
This is why I created the FAQ in the Fertilizing Forum. Look for Maximum solubility, Chemical composition and g / 100 l -> 1 ppm .

Ca ppm
CaCl2 .2H2O 0.3668 gram / 100 liter = 1 ppm

0.22008 gram / 60 l / 15 gall = 1 ppm
2.2008 gram / 60 l / 15 gall = 10 ppm
4.4016 gram / 60 l / 15 gall = 20 ppm

1.1004 gram / 300 l = 1 ppm
11.004 gram / 300 l = 10 ppm
22.008 gram / 300 l = 20 ppm

Mg ppm
MgSO4 1.0141 gram / 100 liter = 1 ppm

0.60846 gram / 60 l / 15 gall = 1 ppm

3.0423 gram / 300 l = 1 ppm

Note:
You can not dissolve 9 tbs MgSO4 in 250ml. See FAQ Maximum Solubility Table.

Edward
 

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Dosing the dry Discus Mix and the Mg Solution to maintain Ca and Mg concentrations is easy. You can start testing Ca and Mg once a week and then adjusting the Mg daily dosing to maintain 1 - 5 ppm. For the Ca, one tsp per 75gall / 300l in few weeks time will do the trick. I keep the Ca between 20 - 30 ppm. These two elements are not being taken by plants as fast as NO3 and PO4 so keeping it in order is not difficult.

Edward
 
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