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Old 12-29-2017, 02:31 PM   #21
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Tearstone's Avatar
Brand: Thor Motor Coach
Model: 2017 Miramar 34.4
State: Florida
Posts: 284
THOR #9721
Originally Posted by Chance View Post
Was a very long time ago, so going from ancient memories.

On my first motorhome, a Coachmen Class C, the black tank was directly under toilet. With the toilet valve open I could see down into tank with a flashlight. Once outlet got plugged, I installed a cap that had a garden hose connection and back flushed just enough to establish drainage. I then re-connected sewer line, opened toilet valve, and using a nozzle on garden hose started flushing from inside out being careful not to break up too much of mound at once. I also had to use a broom handle to help break up the mound in a controlled manner so it wouldn't plug the discharge line again.

It was painfully slow and messier than one would expect, which made it one of those things that you never repeat again. We had made a couple of newbie mistakes that were easily avoidable.

Back then I didn't have access to Internet like today, and hadn't read what not to do that causes these problems.
On my Class A Miramar, the toilet is on the opposite side of the drain. I can only see what is immediately viewable from the toilet on the "high" side of the tank. I did use a similar tactic and move the solid waste that was mounting up around the bottom of the toilet drop. We certainly do not leave the black valve open, but still have an issue with pyramiding. Also, I can only assume the rest of the folks on board are filling up the bowl prior to passing solids.

Russ Sanderlin
USMC Veteran
2017 Miramar 34.4
RV Travel Bug
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Old 12-29-2017, 02:58 PM   #22
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Brand: Thor Motor Coach
Model: Thor Axis
State: Mississippi
Posts: 362
THOR #6203
Bob Denman. That was too funny! 😆

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Old 12-29-2017, 03:20 PM   #23
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Brand: Still Looking
State: Texas
Posts: 3,755
THOR #2121
We made a lot of mistakes initially, including use of inferior TP, using too much, and not using enough water while trying to conserve limited supply. Traveling with other adults who though an RV was like a house didn't help either.

With modern use of macerator pumps and clean-in-place flush systems, I see advantages of having just one large combination tank (grey and black as one) that would minimize some of these problems -- provided floorplan and elevations allow for proper drain line pitch.

I've read reviews of motorhomes (from Class B to luxury coaches) with a single combo tank and don't recall anything negative. The benefits, on other hand, are many; including lower cost, and lending itself to greater automation.
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Old 01-11-2018, 05:52 PM   #24
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Brand: Thor Motor Coach
State: Arizona
Posts: 1
THOR #9871
Look under you M H
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Old 01-11-2018, 06:29 PM   #25
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Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 9,496
THOR #8860
Originally Posted by sforl View Post
Bob Denman. That was too funny! 😆
Thanks; I'll be here all week... try the veal!

Good Sam Member 843599689
FMCA Member F473304

Current coach: Tiffin Wayfarer 24 BW
Former coach: Thor Outlaw 29-H
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