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Old 08-21-2019, 09:10 PM   #1
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Black water in gray tank

Hi, does anyone else have a maserator toilet that dumps to the gray water tank?

Is this normal?

Thanks for any feedback.
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Old 08-21-2019, 09:24 PM   #2
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No, not normal. What coach is this on?
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Old 08-21-2019, 10:19 PM   #3
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Not likely, but many have grey water lines into the black tank...
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Old 08-21-2019, 10:27 PM   #4
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Tell us a little bit more about your RV...

...And welcome to our campfire!
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Old 08-21-2019, 11:02 PM   #5
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Thor tuscany mt44. 2017 model. 1 and 1/2 bath. Rear has maserator toilet mid bath regular rv stool. Mid bath feeds to black along with the rear sink. Rear toilet feeds to gray tank.
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Old 08-21-2019, 11:14 PM   #6
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Quote:
Originally Posted by donmorris View Post
Thor tuscany mt44. 2017 model. 1 and 1/2 bath. Rear has maserator toilet mid bath regular rv stool. Mid bath feeds to black along with the rear sink. Rear toilet feeds to gray tank.
Sound like there is no grey tank under those circumstances...
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Old 08-21-2019, 11:23 PM   #7
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Originally Posted by donmorris View Post
Thor tuscany mt44. 2017 model. 1 and 1/2 bath. Rear has maserator toilet mid bath regular rv stool. Mid bath feeds to black along with the rear sink. Rear toilet feeds to gray tank.
Yeah..... I don't think so. What's the definition of "gray" and "black" tanks? They are defined by what they contain. Human waste is always classified as "black' effluent regardless if it is macerated or not. So by definition, the rear toilet also feeds to a "black" tank.
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Old 08-22-2019, 12:05 AM   #8
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Quote:
Originally Posted by donmorris View Post
Thor tuscany mt44. 2017 model. 1 and 1/2 bath. Rear has maserator toilet mid bath regular rv stool. Mid bath feeds to black along with the rear sink. Rear toilet feeds to gray tank.
Did you buy this coach used?

You may want to contact Thor and ask them for a waste water plumbing schematic and see if the situation is by design or screw up.
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Old 08-22-2019, 12:48 AM   #9
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I'm guessing your tanks a mislabeled like mine is. I have Galley, Gray and Black but there are labeled as Gray, Black and Black. A sink will go to black but black will not go to gray.
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Old 08-22-2019, 01:09 AM   #10
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The schematics for your coach should be on Thor Motor Coach site, owners resources. Enter your VIN and you should find them immediately.
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Old 08-22-2019, 02:13 AM   #11
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Originally Posted by donmorris View Post
Thor tuscany mt44. 2017 model. 1 and 1/2 bath. Rear has maserator toilet mid bath regular rv stool. Mid bath feeds to black along with the rear sink. Rear toilet feeds to gray tank.
Most if the 1/2 bath units that also have the macerator toilet in the full bath are configured with two black tanks

The tank the macerator, washing machine, shower all dump to is labeled grey however it is black

Not sure about all the models or years but many are that way
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