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Actually there's a lot more to it than that. Food grade diatomaceous earth (aka DE ) is processed differently, so you must be sure it's FOOD GRADE . Pool grade de , used in pool filters will kill your animals. I get mine from a local health food store who sells me a 50# bag for $18. That's waaay cheaper than anything I ever found online or at nurserys (it is also used in the landscape for insect control).
I just want to emphasize again that there is a huge difference in food grade de and something you get from a pool supply, so be aware .