Festool Owners Group

FESTOOL DISCUSSIONS => Festool How To... => Topic started by: six-point socket II on March 06, 2017, 09:47 AM

Title: Filter bag capacity of CT-SYS / CTL-SYS
Post by: six-point socket II on March 06, 2017, 09:47 AM

So I've been using my CT(L)-SYS for quite a while now and I'm very happy with it. Happy as I was the day I bought it and I still think it's worth it's weight in gold.

I know it's size requires to compromise on filter bag capacity and it's officially considered more of a cleaning tool than a vac to use with power tools.

As of lately my CT(L)-SYS was behaving differently, reduced suction and a constantly opening/closing safety/bypass valve.

Upon inspection of the bag that had very mixed contents of shop cleaning, drilling concrete/masonry, sanding and cutting wood I decided to ditch it although it appeared to be half full only and inserted a new one.

Now I was building a Sys-Port over the weekend from 18mm ply. Had to make quite a couple of cuts with my TSC, drilled a lot, sanded it - all of it ended up in the CT(L)-SYS. During the last minutes suction went down and I could hear the valve again.

I decided to inspect it a little more thoroughly this time.

Taking out the bag very carefully - the Area I marked red was really packed, highly compressed and hard sawdust. As you can see, looking into the bag it seems hardly half full.



Now I carefully cut the bag and laid it open. The formerly compressed sawdust is now lose. You can see the pores of the bag are quite clogged.


Now I wanted to know how much it actually is/was. It's approx. 1.4l - so basically and according to specs it should be possible to get another 2l in. Given the noise and reduction of suction I doubt it. Unless one would shake the CT(L)-SYS to "decompress" the accumulation of sawdust in the back portion of the bag and then go on. Is it meant to work this way? Is it perfectly fine considered what I ask of it?



Kind regards,

Title: Re: Filter bag capacity of CT-SYS / CTL-SYS
Post by: bkharman on March 06, 2017, 10:57 AM
It is more the clothing of the pores that reduces the suction. I had stated in an older post that I like to use the CT SYS with my ETS EC 125 for small drywall touchups and that fine dust will cause the baffle to shout off. I bought the long life bag and use it a lot. I also will vacuum it out quite often if I am doing anything with drywall. Works well in this method.

Not a perfect vac, but I still love it as well six point!!

I don't own any long life bags except the Sys one. Highly recommend it!

Cheers. Bryan.

Sent from my iPhone using Tapatalk
Title: Re: Filter bag capacity of CT-SYS / CTL-SYS
Post by: ear3 on March 08, 2017, 04:10 PM
Kudos on the visual demonstration!  The compression at the sides of the bag occurs on mine as well.  I think of all the vacs, the CT-SYS is the one that benefits most from the long life bag given the oft-reported loss of suction well before full capacity is reached.  I just vacuum mine out with my CT26, and occasionally bang the bag on the wall outside to clear the pores.
Title: Re: Filter bag capacity of CT-SYS / CTL-SYS
Post by: leakyroof on March 08, 2017, 05:26 PM
I wonder if a cheap paper baffle inside a new bag that changes dust flow though the bag to distribute it differently than what now happens normally, would help with this?.... [scratch chin] [scratch chin] [scratch chin]