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Old 09-14-2018, 03:01 PM   #1
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Winterization - black tank rinse

When winterizing should I do anything special with the blank tank flush?
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Old 09-14-2018, 03:15 PM   #2
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I blow some air in it because the back flow valve or other inerds might hold some water.
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Old 09-14-2018, 03:18 PM   #3
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Dump a little rv antifreeze down the toilet.
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Old 09-14-2018, 03:19 PM   #4
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If there's a check valve in there, remove the screen cover, use a screw driver and press the valve stem. The water will drain back into black tank. I do similar on the city water inlet. when I've pumped the system full of AF, I relieve just a little pressure on the system, remove filter screen and press the valve stem...WHILE STANDING OFF TO ONE SIDE !! The remaining pressure will force AF and remaining water out of the city water inlet.
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Old 09-14-2018, 03:22 PM   #5
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Quote:
Originally Posted by rbq View Post
Dump a little rv antifreeze down the toilet.
This action has no effect on the black tank flush... not talking about the black tank drain valve.
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Old 09-14-2018, 03:25 PM   #6
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Sorry, didn't read that right.
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Old 09-14-2018, 03:30 PM   #7
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My Roo is pre flush valve years. If you have access to an air compressor get the fitting thst goes between air line & blow the line out. Use low 30# pressure. I do this with my water system. Only use antifreeze in drains & toilet.
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Old 09-19-2018, 07:48 AM   #8
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Winterizing the water supply plumbing on the toilet is one thing but I think the OP is asking about the black tank flush.... Most black tank flush systems are simply a separate city water connection which connected to a hose that runs to a spray head in the black water tank. Running antifreeze through the fresh water side of your Roo is not going do anything for the tank flush nor will connecting and air compressor since it's a separate line.

I could be wrong here but since the system is open on both ends, I wouldn't think any water would be trapped in there..

If you want to take extra precaution you can do 1 of 2 things:

1) The easiest is to connect an air compressor to the female hose fitting and blow all the water out of it.
2) Or you could run some anti freeze through it.... The challenge here is there is no pump so you'd need to allow gravity to create enough pressure to purge the water in the system and replace it with anti freeze. What you'd need here is a funnel with some hose attached to it and put the hose into the inlet, hold the funnel up high to create enough gravity to allow the anti freeze to displace any water.
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