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forwarded message from George

George Booth asked me to forward this for him. I'm sure you all wish him well.


Hello APD Readers,

Some of you may have noted my absense while I was on vacation. Although I
recently returned and just started a "fun" thread, I have to be off the list
again. I found out yesterday I need to have some routine eye surgery to repair
a detached retina and won't be at work for a few weeks. I owe some people e-
mail responses (Karen and Dave Gomberg epecially) but won't get to those for
awhile.  Sorry.

But, as one last post, let me say:

>Date: Tue, 16 Jun 1998 03:47:37 -0700
>From: Steve Pushak <teban at powersonic_bc.ca>
>Subject: George on the soap box again

Very clever, Steve. "Hardness" measurements have their origins relating to
soap. "Soap box" -- good one.

>Clarify for me if you will, how to determine the calcium concentration
>from a GH measurement, please George? Could you also explain how to get
>the magnesium concentration??

Well, it's not rocket science. First one must buy the LaMotte Hardness test
kit model PHT-CM-DR. Using a simple titration technique, one first determines
the "Total Hardness" (their term) which is Ca+Mg. This test has a resolution
of 4 PPM.  Then, using different reagents in the same test kit, one determines
Calcium hardness (same resolution). By subtracting calcium hardness from total
hardness, you have now determined magnesium hardness.

I hope that was clear enough.

George in Colorado