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Old 08-08-2015, 06:50 PM   #31
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Thetford Macerating Toilet

A Macerating toilet is basically a garbage disposal in your toilet. Breaks things down into much smaller pieces so they move through the system easier.

Terry & Kim
Dallas, Texas
2015 Berkshire 38A
2007 Jeep Wrangler JKU
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Old 08-08-2015, 09:09 PM   #32
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Pardon my ignorance but what is the purpose of a macerating toilet. Is this what you use when on one of those extreme high fibre diets?

Personally we have a no poo policy in our MH

Because the RB model has a rear bath the poo needs to be pumped to the BT. It's to far to depend on gravity like most Rv toilets.
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Old 08-08-2015, 09:57 PM   #33
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Originally Posted by tkdavis View Post
A Macerating toilet is basically a garbage disposal in your toilet. Breaks things down into much smaller pieces so they move through the system easier.

Terry & Kim
Dallas, Texas
2015 Berkshire 38A
2007 Jeep Wrangler JKU
Actually, is pretty much liquefies everything. What comes out of the BT would pass easily thru a garden hose.

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Old 08-08-2015, 10:14 PM   #34
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Just to clarify the comment about it being like a garbage disposal. It's not. It a 12 V pump made of plastic and will jam if it encounters anything but poo and the correct paper. It is a most unpleasant task to take it apart and remove that which doesn't belong in the toilet. Just a warning most unpleasant!
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Old 08-11-2015, 10:46 PM   #35
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Boo a frustrating day for the Thetford guy. That guy tried everything. They have no idea why it won't work.
Things he ruled out where the j pipe is high enough
The black tank is not a vacuum.
He tested the voltage when flushing and it did drop to 11 volts for a second but quickly returned to 12.8.
They are still trying to come up with a fix.
I'll keep you posted.
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Old 08-12-2015, 11:17 AM   #36
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Boo a frustrating day for the Thetford guy. That guy tried everything. They have no idea why it won't work.
Things he ruled out where the j pipe is high enough
The black tank is not a vacuum.
He tested the voltage when flushing and it did drop to 11 volts for a second but quickly returned to 12.8.
They are still trying to come up with a fix.
I'll keep you posted.
Thanks Phil...... Looks like the mystery just deepens.....

And maybe the "stuff" too????
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Old 08-12-2015, 05:02 PM   #37
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So the mystery remains with no answer. They are still working on it but Thetford (Norcold) says we need to add a ventless trap? to the line at the sewer line. No one at FR thinks that will fix the issue. Thetford did acknowledge that they have had several issues exactly like this and the issue is not just with FR. So this is what they want to add. Click image for larger version

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I totally disagree with the fix as I think this will make the poo go faster. They say it will slow it down.
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Old 08-12-2015, 06:14 PM   #38
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I totally disagree with the fix as I think this will make the poo go faster. They say it will slow it down.
What has making the "poo" go faster (or slower) have to do with all the clear water (after a complete flush) failing to remain in the bowl.

If Thetford has seen this before why haven't they fixed it? If other coach vendor are having the same problem, then it shouldn't be FR, correct??

I haven't unbolted mine from the floor for quite some time, but maybe I need to take another look at that actual exit plumbing to see if anything makes any sense at all.


I mean, it has to be a simple case of basic hydraulics or fluid dynamics, right?

Where is Archimedes when we need him?


EDIT:: DW just said she thinks she hears the "grinder" pump still running after all the water and "stuff" has left the bowl. Maybe it doesn't shut off soon enough? If not, then it would probably pump all the fresh incoming water back OUT, thereby leaving the bowl empty, right?? As I sit here thinking of it, I'd wouldn't be surprised if that WERE the problem. If so, tell Thetford/FR they owe me $5K in consulting fees.

Boowho??
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Old 08-12-2015, 06:41 PM   #39
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I will ask the in the morning. If you are correct I can get an address to send the bill.
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Old 08-16-2015, 01:03 PM   #40
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I will ask the in the morning. If you are correct I can get an address to send the bill.
So this is now a "dead" issue? NOBODY knows what the problem is, nor how to fix it??

Boowho??
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