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Discussion Starter · #1 ·
There are situations where people are trying to resolve pale new growth by increasing TE trace elements, iron, NO3, K etc. without success.
The actual reason may be in the presence and/or ratio of Ca and Mg. Usually people think if there is GH there must be Ca. Wrong. There may not be any Ca or any Mg and still get nice dGH readings.

Magnesium = GH - Calcium

Mg ppm = ((17.86 x dGH) - (2.5 x Ca ppm)) /4.1

Example at 1 dGH:

Ca : Mg [ppm]

7.0 : 0.0
6.0 : 0.7
5.0 : 1.3
4.0 : 1.9
3.0 : 2.5
2.0 : 3.1
1.0 : 3.7
0.0 : 4.4



Edward
 
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