When I added CYA, I measured it out and put it into a sock, the next day, the sock was almost completely full still, and I checked and my level was showing 35, it's been over a week and it is still reading 35 too, so I removed the sock. I am afraid to know what the level would have been had I not removed it.
So keep an eye on that level, and if it reaches where you want it before everything is dissolved, you might want to go ahead and vacuum what is left out. It is rare, and I could have made a mistake somewhere in the measuring, but I really do not think that I did.