Perma Guard Diatomaceous Earth Fossil Shell Flour Food Grade 5 lb (4/Cs)

Perma-Guard OMRI certified Diatomaceous Earth is the purest food-grade fresh water amorphous silica diatomaceous earth available. Perma-Guard is derived from fossilized diatom remains. It is approved as an anti-caking agent in feed not to exceed 2% of rations fed and meets FDA regulations to be considered food-grade.