I just use my shop vac with a HEPA filter on it. They sell a water trap that you can hook up between your shop vac that's used to trap joint compound dust during sanding. All it is is a 5gal bucket with 2 ports on top. One is submerged in the water (about 1/2 way) the other is not. All you do is fill the bucket with water and hook your shop vac and your good to go. I use this when I need to do drywall sanding. It's a cheaper way to go than using the HEPA filter/bags.
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