Title: ...But Do You Even Need Them?
Product review: I run my Porter Cable Wet-Dry vac (7812) with only the top filter -- No vacuum bag.For shop sawdust and garage dirt, naked is fine. Nothing noticeable in the exhaust. The top filter shakes out with the pull-tab every few days and more thoroughly by hand when emptying the vac. My original top filter is still good after 4 years.If you're vacuuming drywall dust indoors, that's different. Use a bag.But for workshop and garage use...I've saved $300 that I can now spend on tools I don't need. :-)
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