Black tank blockage

[kayserj]

We ran into a similar problem and we couldn't bust it loose. We tore it apart and found when they drilled the tank to put the drain fittings in, that piece fell into the tank. When we dumped it, it lined up just right over the hole and formed a blockage. We got the round piece out and haven't had any issues since. Good luck!

[Thorchini]

Tearing the bad pump apart, I found it was hair that had it frozen up, the screwdriver on the end would turn it. I pulled the grinder off the end and that's where the hair was. Got that off and it seems to be fine. Tore the 4 nuts off the end and looked at the rubber impellor, and it was shot, missing part of it. Looks just like the water pump on a boat. I wonder if I can get a replacement impellor?? Would be a cheap fix.

[Dodgey]

Originally Posted by tricotec

Pouring a few bags of ice into the tank before a few hours of driving really scrubs the bottom of the tank. This was a trick we learned online, and it really works.

Thanks, heard of this before and anotger popular one is a few large bottles of cheap coke. I do plan on trying at some stage, partly for interest and it'd be nice to see the tank guage work, well at least once

I seem to have the measure of our tank now, secret is as mentioned above, plenty of flush water. The problem I see is our tank design, which seems common on a number of Damons.
It runs across the coach, shallow to the right side, depening by a few inches to the left side with a small bowl in the dump locker. Toilet is set about 3ft in so the depth beneath the pipe is approximately 8 inch, on a shallow slope. Not rocket science, but any, err, solid deposite, even just paper, hits the bottom of the tank and stops, water running away, and if not careful this build to a mound. Obviously not an issue once the water level in the tank comes up but in normal operation this takes 5 to 6 days, and equally if we pre filled we'd lose 5 to days capacity, so during this phase of use we just use extra water for flushing and no problems. This, however, does reduce off site time conciderably as we need to take on water, very annoying, but a small price to pay for what is otherwise a great coach.
By contrast the little Winne Brave we had last gave no issues, even going light on flush water, toilet went straight into a large rectangular tank, impossible realisticly to block.
Just wish Damon had put the toilet in the corner of the bathroom, ie over the deep, bowl section of the tank.