"He who marches out of step hears another drum." ~ Ken Kesey
Don't have sludge in the bottom.We put 2-3" rocks on the bottom of ours when we had a sludge problem but we took them out a while back.
I've told the guys not to leave the screens in the tank unattended for long amounts of time to keep the emulsion from dripping off to the bottom of the tank. It's helped a ton, getting to the screens with the pressure washer before the emulsion falls off and de-inking properly has almost eliminated the bottom sludge. We've had it 4-5" thick before.
How bad is using a dip tank for wood frames? a NO NO or what Darryl