[Edward]

That's what I was thinking as well. Separate accurate measurements of Ca/Mg require expensive kits, so I am not sure what exactly the values are in my tap.

Hi shalu

Surely you already have a GH kit, so the only one you would need to add is a $6 Ca test kit. You can get Mg concentration by testing for GH and Ca, then calculating the Mg.

Water hardness, magnesium and calcium article

Edward

 

[Edward]

Hi Shalu

Look at the article again. There is a description on a Hagen test kit. Most of us use it with great success. The increments of 10 ppm work just fine and we never had a bad kit.

Edward