The shell is made of semi-porous material and would allow the body fluids to evaporate away without the waxy coating. The small DE particle edges are very sharp and it punctures through the waxy coating. It also absorbs liquid, speeding the time of the insect's death. If the insect ingests the DE, his digestive organs are abraded. DE is also highly effective in repelling incoming insects.
Pyrethrum is a natural vegetable extract from a variety of Chrysanthemum flowers.
Its use dates back to the days of the Egyptian pyramids. Piperonyl Butoxide is another vegetable extract first discovered in Sassafras and pepper plants and is used as a synergist to magnify the effects of the Pyrethrum. Perma-Guard is a stainless, odorless dry powder substance that can be safely applied directly on your pet, in your home, in your yard, and in your garden. It can also be mixed with water and sprayed. Can be applied on the animal, in their sleeping quarters, on carpets, rugs, and in the yard.