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Re: pearson's square

> Date: Wed, 23 Jul 1997 18:06:24 -0500
> From: Daniel Hawley <dhawley at iamerica_net>
> I came upon the name "Pearson's Square" in a book about fish diseases
> and wonder if some of you chemistry folks might have a copy of it in
> table form This table is supposed to show the required proportions of
> tap water and rainwater to create a specific dh hardness of rainwater
> and tap water combination.

I've seen that but it's not magic or anything -- just a pictorial way
of doing proportions.  Simply stated, if you have a gallon of water
with 20 degrees of hardness and you combine it with a gallon of water
with 0 degrees of hardness, you have two gallons of water with 10
degrees of hardness.