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Re: calcium tablets

To: Aquatic-Plants at actwin_com
Subject: Re: calcium tablets
From: "Roger S. Miller" <rgrmill at rt66_com>
Date: Sat, 17 Feb 2001 07:46:26 -0700
References: <200102170848.DAA03413 at actwin_com>

A reader previously wrote:

> >What about blackboard chalk pieces ?

Blackboard chalk was traditionally pure CaCO3.  Two or three years ago I
suggested chalk as a source for calcium and Paul Sears pointed out that
chalk these days isn't always CaCO3.  I checked what I had; it wasn't. 
Check yours before you try using it.  If it is CaCO3 then it should fizz
when hit with a drop of vinegar.

If you find some blackboard chalk that is CaCO3 then it should be a
useful source of calcium.

Roger Miller

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