Yes, the O'Reilly's parts are correct for Ultrasorb
You can also use Optisorb if you can find it which is the same DE in a coarser grade. Also the Blue Ribbon DE car litter is exactly the same as Optisorb. The larger bags are usually more economical.
The coarser grade DE isn't harmful to anything including insects. Only when DE is finely powdered and dry does it have those sharp razor edges that are harmful to soft bodied insects.
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