On Sun, 04 May 2003 23:00:48 GMT, animaux wrote:
On Sun, 04 May 2003 13:04:47 -0500, Rusty Mase wrote:

They sell big bags of diatomaceous earth at pool supply places.

This is NOT the same type of D.E. as the horticultural and food grade D.E.

D.E. is D.E. no matter what you call it. It is a mined mineral from
deposits of diatom frustules that consist only of amorphous silica.
D.E. has a higher melting point than glass, another amorphous silica,
but considerably less than sand, a crystaline silica.

You can add clay to it and call it food grade if you want.

Also, it is not good to breath D.E. dust but it will not hurt you as
would a find sand - a crytaline silica - known to cause silicosis and
possibly lung cancer. If you look at the stuff from the pool supply
in a microscope it just looks like pieces of diatom frustules, nothing
more. I do not think the pool grade stuff has something added to it
to make it more affective as a filter media. It is affective doing
this in its natural condition.

Rusty Mase



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