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Re: pearson's square

To: Aquatic-Plants at actwin_com
Subject: Re: pearson's square
From: George Booth <booth at hpmtlgb1_lvld.hp.com>
Date: Thu, 24 Jul 1997 09:04:17 -0600
In-Reply-To: Your message of "Thu, 24 Jul 1997 03:48:09 EDT." <199707240748.DAA25179 at acme_actwin.com>

> 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.

George

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