Safe Solutions DE Fossil Shell Flour® (food-grade quality) is pure diatomaceous earth and can be used in a variety of applications. Food-grade DE is a beneficial feed-additive for pets, horses, and livestock and can also be used in organic gardening. DE can even be applied throughout the home to help against many different pests. Combine DE into a TweetMint Enzyme Cleaner, TweetMint Plant Wash or Not Nice To Bugs solution to create a longer staying power once the solution dries. Ingredients: Food-grade Diatomaceous Earth