Well, I put this off for way too long, and this made the job horrifying.
I must have blown out about a pound or more of dust from the pleats of the dust collector cartridge filter. All very fine dust, plus, interestingly, the remnants of a Publix plastic grocery bag (ripped into very small pieces).
Trying to blow out the filter from the outside was a joke. It did nothing at all. So I spent about an hour, in a Tyvex suit and wearing a P100 ventilator outside and blew out as much as I could until I just couldn't take doing it anymore. Quickly tried afterwards to vacuum the pleats with a wet-vac brush, but that didn't seem to do anything.
So much smoke rose, I wonder if my neighbors thought there was a fire.
The filter was 3 years old, so I guess that was 3 years of accumulated wood dust. Clearly my bad. Especially since it's hooked up to a wide belt sander.
So, lesson learned. Don't wait 3 years between cleanings.
And even worse, somewhere I have a Magnehelic gauge that I never bothered to hook up. So not a clue how much this was affecting my dust collection.
Also, to make things worse, when I tried to clean up some of the piles of tiny wood dust that fell on the floor when removing the filter, I noticed that my long Festool vac hose is mostly obstructed. I have no clue how I'm going to clean that out. Any ideas?
Probably going to have to throw out that brand new Tyvex coveralls. Certainly can't spray a finish with them. Is Tyvex washable??