Ok, the General Hardness (GH) is a measurement of mainly the Ca and Mg ions in the water. One can easily find tables that show the conversion from dH (the units in which GH is usually measured) to ppm.
Since both the Ca and Mg are important in growing healthy plants it seems that we need to be more aware of the amount of these 2 elements.
Say I have GH=4. That means that I have 70 ppm of Ca and Mg.
How much of the 70 ppm is Ca and how much is Mg? Could I have 90% Ca and 10% Mg?
Also - should the Ca to Mg be kept in a specific ratio?
--Nikolay
Since both the Ca and Mg are important in growing healthy plants it seems that we need to be more aware of the amount of these 2 elements.
Say I have GH=4. That means that I have 70 ppm of Ca and Mg.
How much of the 70 ppm is Ca and how much is Mg? Could I have 90% Ca and 10% Mg?
Also - should the Ca to Mg be kept in a specific ratio?
--Nikolay