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The DE used in pool filters has larger particle sizes and is much more dangerous to breath because of it. The pesticide grade DE is what is called "amorphous silica" while the pool filter grade is "crystalline silica." The pesticide grade does contain trace amounts of crystalline silica, however.
Besides, pesticide grade DE is cheap enough at Home Depot:
https://www.homedepot.com/p/Safer-B...ea-Ant-Crawling-Insect-Killer-51703/206857782
Besides, pesticide grade DE is cheap enough at Home Depot:
https://www.homedepot.com/p/Safer-B...ea-Ant-Crawling-Insect-Killer-51703/206857782