DiatomPest® Diatomaceous Earth is effective in both repelling and killing most crawling and flying insects including: Aphids,  Ants, Bed Bugs, Beetles, Cluster Flies, Cockroaches, Earwigs, Fleas, Mites, Silverfish, Slugs, Snails, Ticks. The diatom remains that make up the powder form of Diatomaceous Earth have razor sharp edges. These edges, when bought into contact with an insect, pierce’s the outer shell which allows room for the Diatomaceous Earth to seep inside the insects body. Once the powder gets inside an insects body it starts to absorb the liquids from the body, killing the insect in the process. Our Diatomaceous Earth is sourced from the purest fresh water, it is food grade by FDA standards and is eco-friendly and organic