Diatomaceous Earth 1kg: For horses, dogs, cats, and chickens, Ozz Organics Diatomaceous Earth (DE) is an all-natural worm and parasite treatment. DE is a type of natural silica that is made from powdered, fossilised remains of hard-shelled algae. Effective against internal parasites such fleas, mosquitoes, spiders, ticks, flies, and roundworms, pinworms, threadworms, and hookworms. Benefits and Features: Controlling worms and parasites naturally Repels insects Control of worms and parasites that works. This product has additional freight depending on location. We will contact you with a freight quote