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Re: Diatematrous Earth Now Diatom(aceous) Earth

Square Foot Gardening List - http://www.flinet.com/~gallus/sqft.html

A repeat from a previous message I wrote on DE:

I'll quote here from Occupational Health: Recognizing and Preventing
Work-Related Disease, 3rd Edition, Levy and Wegman, 1995:

"Diatomaceous earth is an amorphous silica material mined predominantly in
the western United States. It is used as a filler in paints and plastics, as
a heat and sound insulator, as a filter for water and wine, and as an
abrasive. In contrast to the various forms of crystalline silica, amorphous
silica has relatively low pathogenicity.  However some processes using
diatomaceous earth include heating (calcining) it to remove organic
material. This heating process can produce up to 60% crystalline silica as
cristobalite, which is highly fibrogenic."

In other words, use the horticultural grade of DE.

Frank Teuton


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