Thoughts on sanding drywall with a Festool sander.

Try 120 grit for the initial passes and once you're happy switch to 150-180 to finish.
 
[member=52895]Gjarman12[/member] My CT26 is still fairly new, and is a HEPA machine. I haven't really looked at the filter. The job I am doing is renovation work for the inlaws, I don't use it every day on drywall. If I did then I should be using a CT36AC with the automatic filter clean.

 
I've used the little Festool hand sander with my dust deputy equipped shop vac to finish drywall.  I put a router speed controller on it so the sander wasn't pulled too tight to the ceiling.  It worked well and really cut down the dust.  It wasn't a huge area and I was just finishing a top coat where I had damaged the paper a bit taking down popcorn ceiling.  Worked well.  The dust deputy seemed to get most of the drywall dust.  It had a large amount in the bucket under it and the filter was not clogged and didn't even have significant visible dust in it (quasi HEPA filter). 

I can sand faster with a sanding sponge but I will also get a talking to from LOML.  In a large area I might try a power sander but on regular drywall mud it doesn't take much effort to do by hand.  The setting type mud (hot mud) is much harder and a power sander isn't a bad idea.  If I did this for a living, maybe I'd use a power sander for all of it.  That Planex looks nice.  I wonder how it works relative to the similar PC sander. 
 
Try using mirka sandpaper.  The dust extraction will be improved.

I am removing drywall texture in my home and using Mirka sandpaper, the one that looks like a mesh (Mirka Autonet 150 and 240).

 
I use Granat with an ETS150/5 for drywall plaster sanding and usually my CT-Mini. Does a great job and never had a problem.

taking the filter out and and giving it a bash when you empty the bag is reasonable practice if you're not generally using it for harmful stuff.
 
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