Wholistic Pet Diatomaceous Earth Natural Dewormer is a safe, non chemical alternative to chemical dewormers and is an effective adjunct to any worming program. Wholistic Pet Diatomaceous Earth consists of the dried skeletons of microscopic sea creatures called diatoms. Diatomaceous Earth works by destroying parasites in the intestinal tract. The diatoms cut away the exoskeleton of the parasite, exposing their inner organs to dessication. Wholistic Pet Diatomaceous Earth can also be sprinkled on bedding or in other areas of pest activity. This natural wormer will also destroy fleas, ants and other pests.