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Old 08-31-2015, 04:12 PM   #1
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How do you winterize black tank flush???

I think that I've finally got this somewhat figured out, but now I'm wondering
how you winterize it. Since it is separate from the main plumbing system, I believe?
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Old 08-31-2015, 04:17 PM   #2
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I've never winterized mine.

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Old 08-31-2015, 04:19 PM   #3
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Ive never winterized mine either. I guess if you were worried about it, you could blow air through it maybe?
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Old 08-31-2015, 04:24 PM   #4
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Just before I winterize my Lexi's lines, I pour 2 gallons of rv anti-freeze in both the black tank and gray tank. Maybe overkill, and not needed, but the stuff is cheap enough, and I don't worry about any water left in the tanks freezing.
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Old 08-31-2015, 04:29 PM   #5
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Not generally considered a big issue, but the presence of any water in the tank seems to risk some freezing around the valve seal. Therefore, I always try drain it well at my last dump of the season, and again at winterizing time. If you use RV antifreeze, you will be adding a little of the pink stuff to it when you flush the toilet to winterize the supply lines to the toilet. I try to run the flush until there is about as much pink stuff down the drain as there was water before it. That should technically do the job.
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Old 08-31-2015, 04:30 PM   #6
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I agree with grumpy...

Quote:
Originally Posted by grumpy0374 View Post
Just before I winterize my Lexi's lines, I pour 2 gallons of rv anti-freeze in both the black tank and gray tank. Maybe overkill, and not needed, but the stuff is cheap enough, and I don't worry about any water left in the tanks freezing.
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Seems like a cheap piece of mind.
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Old 08-31-2015, 04:30 PM   #7
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Never have winterized my black or grey tanks. I drain them that's it. I blow air thru my water lines and fixtures and drain water tank. Never had an issue. Takes 1 beer to winterize my RV if DW helps by opening and closing water faucets. Our 5er doesn't have pee traps so I don't pour RV antifreeze down the drains.
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Old 08-31-2015, 05:02 PM   #8
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I blow out the black tank flush when I blow out the rest of the plumbing lines.
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Old 08-31-2015, 05:18 PM   #9
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I use an air compressor to blow all the regular water lines then add antifreeze to them and run the antifreeze until some goes down the drains. I always dump some extra down the drains after, enough to push all the water out of the traps then open all the black and gray tanks to get any liquids left in the tanks out. Never had a problem in 17 yrs.
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Old 09-01-2015, 12:45 PM   #10
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When I drain mine for the last time of the year, I leave the drains open. I then dump a quart of antifreeze in each of the "P" traps. (sinks, shower, toilet)

The water will drain out of the traps and out the black and gray tank drains. Any residual water in the tanks and drains should now be diluted with antifreeze.
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