What To Do With Unused Diatomaceous Earth?

Q: I have some unused diatomaceous earth that I had for my pool but no
longer need. Does it have any useful purpose for either the garden, lawn or
flower bed?
A: Diatomaceous earth used for a pool filter is not the same as diatomaceous
earth used for an insecticide. The pool filter product has been treated to
remove the sharp edges of each particle. This defeats the purpose of cutting
the skin of pest insects. I don’t know of an alternative use for the product other
than giving it to another pool owner or putting it in the garbage.