I have only used my pot blaster inside the cabinet for the one tractor fender that you see in the photo. The buildup in the hopper has not been great enough to empty it yet. The hopper has a bottom "dump valve" on it. My plan is to eventually dump out the excess, see if it needs to be strained, and reuse it. I don't use actual silica sand. I use Black Beauty blast grit, a slag product that is low in free silica and is safer from a health perspective. It cuts better and lasts longer than sand but is also more expensive, so reuse is desirable. I wouldn't find it a nuisance to do this. I don't use the cabinet that much and the hopper is fairly large - so emptying is not something that needs frequent attention. The faster speed makes this a non-issue, at least for me.

I would think a decent shop-vac would do the job well enough. The vacuum you see in the picture came with the cabinet as a package deal. The innards are interesting. It doesn't use a cartridge inside. Instead, it uses a filter bag arrangement that is self-cleaning and will last indefinitely until leakage occurs. What's interesting is the self cleaning aspect of it. It's a weighted bag where the bottom gets raised up (bag is turned inside out, if you will) when the vacuum is running (vacuum is applied inside the bag) and the weight drops it down when the vacuum shuts off. I think this is to shake off accumulations of dust on the bag surface. In this case, the captured dust is on the exterior of the bag and not the interior. The recommendation from TP Tools, the cabinet manufacturer, was to direct the vacuum exhaust directly to the outside unless an optional secondary bag-type "final filter" was used on the discharge. It was not convenient for me to do that, so I got the optional final filter. I think that is a safety precaution because the instructions say there is not supposed to be any accumulation of dust in the final filter. If there is, it's an indication that the internal filter is leaking and needs replacement. The final filter is the blue bag you see on the vacuum exhaust port. There is no visable discharge of any dust from the unit when the cabinet is in operation.

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