Be sure to get Food Grade Diatomaceous earth if using for pests in the garden (kills pests, non-toxic to humans and pets. You can pick a tomatoe from the garde with the white powder remaining on the fruit, and eat it without any harm, Only benefits), or using it internally for parasite removal ( 1 tsp in a loaf of homemade bread is one way to get it into your family), or for flea control in pets ( just dust them once a week, or more often if needed). For immediate flea death spray 50/50 organic apple cider vinegar with the mother, and distilled water directly on pet. The smell will go away when it dries.
Same with Hydrogen Peroxide used internally as in a nebulizer treatment with just 6 drops of 3% food grade hydrogen peroxide in 2ml distilled water or sterile saline to clear lung infections. You can buy 12% or 35% food grade hydrogen peroxide and mix it yourself for internal use 3%, but for cleaning your home you can make it stronger. 35% will unclog a drain, but also burn skin.