"1 part Diatomite (Napa Floor Dry 8822, but other Auto parts chains have their own brands of the same thing)" Just a quick note about floor dry/oil dry products, each brand is a little different and if buying brands other than NAPA make sure that you determine what the product is made out of before you start using it. Some brands are similar to cat litter and when wet they break down and create a thick silt. Best to read the product labels carefully and soak the product in water for a couple days to see how it acts before using it in your plants. Barb