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Old 04-25-2021, 03:53 PM   #1
2 Rivet Member
Sheridan , Wyoming
Join Date: Feb 2020
Posts: 34
Question on Partial de-winterizing a Sport

We live in Wyoming and do not plan on 100% de-winterizing until mid-May. However we do plan on going somewhere this coming weekend, May 1st, with our Sport.
I was planning on using the toilet, only for urine, using a jug of water to flush. The water lines were blown-out and have antifreeze in them so the lines would drain a little during each flush. That would only add some antifreeze to the black water tank and air to the lines. Once we got home I would drain the tank ( we have a dump station ) but not rinse the tank until fully de-winterized. Can anyone think of a reason why this would not work for the next 2-3 weeks?
Thanks for the advice.
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Old 04-25-2021, 04:04 PM   #2
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2016 27' Flying Cloud
Hartsburg , Missouri
Join Date: Dec 2015
Posts: 417
I think what you are proposing is fine. You could be extra cautious and keep a gallon of rv antifreeze in the bathroom to flush with. If you are just putting urine in the toilet you shouldn't need to use much if any to rinse the toilet.--Frank
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Old 04-25-2021, 04:55 PM   #3
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2014 20' Flying Cloud
Sag Harbor , New York
Join Date: Jun 2015
Posts: 17,550
Should be fine IMO. Suggest adding 1 gallon of RV AF to the tank now, and have one on hand as Frank said. You could poop a few times too, without risking damage to the black tank IMO. For a short trip, no need to add water and chemicals, although there could be some odor, when you open the trap door to release the contents of the toilet. When you get home and can dump, you can always stick a hose down the toilet to flush out any solid material left.

If the weather is mild, fill the black tank 1/2 full with water [from a hose down the toilet] as you get close to home, and let the road action macerate the contents into a slurry [if you added solid human waste material during the trip].

Damage from liquids freezing only happens in a mostly-closed container, with vertical sides. An almost-empty black tank with a small mound of semi-solid matter in the middle, surrounded by RV AF mixed with urine, will not do any damage IMO.

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