Sticking with Expert Advice

There is DE that is food grade but is not for consumption -- it's for gardening only. It was Dr. Knight that specified food grade flour. Dr. Knight was also clear that there are many types of DE on the market. I'm staying with what the expert on this and won't try anything else. It was Dr. Knight who also suggested PermaGuard because of the testing of this product and others. The labeling on PermaGuard seems pretty clear to me.

I copied the picture not sure if it is visable. Anyway, on the package it clearly says "PermaGuard Fossil Shell Flour"
....contains less than 1% percent of Crystal & Silicon!