Diatomaceous Earth - Knowledgebase Question

Bloomfield, Io
Question by peterjay
March 7, 2010
Is there a significant difference in the use of diatomaceous earth in pool filters vs. use in insect repellent?

Answer from NGA
March 7, 2010


Diatomaceous earth is ground up diatomite, a naturally occurring form of silica that was originally algae long, long ago. It is used on the soil surface according to the label instructions. The sharp bits cut into soft bodied pests such as slugs and cause them to dehydrate and die. Horticultural diatomaceous earth can usually be found locally at garden centers. Pool grade DE is Diatomaceous Earth produced for pool filters and it is treated with heat, causing a change in the chemical compound; the silicon dioxide becomes a crystalline form which renders it useless for insect control.

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