Roger, my tunze 6100 started beeping the other day so I turned it off until I had time to try to clean it. I can't seem to get the drive unit/impeller out of the main housing in my 6100 -- it is stuck. I tried soaking it in vinegar, at first overnight then when that didn't do anything, several days and still no change.
I can pull it out a little bit...somewhere between an eight and a quarter of an inch but even that requires more force than it should.
Is there any way to go about repairing this unit? What else could I try to get the drive unit out?
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