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[AGA-Member] addenda to magnesium question
- To: "Aquatic Gardener's Association" <email@example.com>
- Subject: [AGA-Member] addenda to magnesium question
- From: Heather J Gladney <firstname.lastname@example.org>
- Date: Mon, 21 Feb 2005 21:31:05 -0800
- User-agent: Mozilla Thunderbird 0.7 (Windows/20040616)
Upate on Mg calculations for answering my own question, "How much change
in dGH does that much Mg do?"
For current dKH of 5 - 6, or 89.5 -107.4 ppm Ca, a 4:1 ratio of lime:
Epsom salts gives 22.38 - 26.85 ppm Mg.
My hardness test kit instructions show 17.9 ppm = 1 degree for both dKH
**Therefore (doh!!) divide the ppm of Mg by 17.9 ppm per degree of
general hardness to convert into dGH.**
(I'm more comfortable in dGH because that's how my test kits are
22.38ppm/17.9 gives 1.25 dGH as lower end, and 26.85ppm/17.9 gives 1.5
dGH at upper end.
so a range of 1.25 - 1.5 dGH added by the Epsom salts is not bad.
I could substitute the Epsom salts at this high range for all of the
soda if I wasn't worried about sulfur in the Epsom salts plus that in
the K2SO4 for the K.
Does 4 - 4 1/2 tbsp Epsom salts for 76 actual gallons (90 nominal) sound
reasonable to other folks?
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