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If you wish to believe what the sellers claim about DE being a dewormer, by all means spend your money... they made their money. They say it kills internal worms including roundworms. Roundworms in chickens are about 3 inches in length....about the size of alot of earthworms. Yet they say DE wont harm earthworms????????? They even go on to say that earthworms carry DE into the soil and it's good for them!!!! Think about it.
There are 2 types of DE: One for feed that is stored in grain bins to keep it dry from moisture. The government gave the label "food grade" as a designation so that DE could be mixed in the feed. That's where the term "food grade" came from. It wasnt meant to be eaten, only as a drying agent.
The second use for DE is in pool filters. It is a more "course" grade of DE and not meant to be put in feed because of it's courseness. This is most likely the type of DE that in your filter for your aquariums.
DE is over 80% silica...the equivelent to sand. Why would anyone feed sand to their chickens is beyond me.
As a drying agent, DE is good for dehydrating lice/mites and other bugs and keeping coops dry, it absorbs moisture. When it becomes wet, it's bug killing effectiveness is nil, until it dries.
Hope this helps.