Winterizing black tanks

[941cowboy]

Any advice for winterizing black and grey tanks?

[Lonestar]

Drain the contents?

[AZMike]

Any advice for winterizing black and grey tanks?

I simply clean my black tank thoroughly with a wand, and treat all the tanks with a tank treatment (I use RV Digest It), leaving 2 or 3 gallons of water in each tank. Since I live in Arizona, I do not have to worry about any potential freezing.

[TNFSolitude]

All I've ever done is leave the -50 pink antifreeze in them. I use 5 gallons to do all the winterizing and pour generous portions down the sinks, shower, washing machine and flush the toilet. In 16 years of camping in a TT I've never had an issue. I live in Michigan and the camper is stored outdoors. That being said I'm always open to any tips others may offer.

[Guest]

I do the same. Open up the drains at first to purge water and during the final pickling, close them off and leave some antifreeze in the tanks.

Jim

[Yoda]

Any advice for winterizing black and grey tanks?

I drain and clean the tanks - flush with fresh water, then leave the drain valves open for a week to dry out, Never an oder problem. During the week I cycle the valves to remove any moisture in the seals. Thanks for the post as it reminded me to do this now while things are warm.
Keith

[Talexm]

Not sure where you're located, but NW Adventure Rentals is a great RV repair shop with locations in Spokane, Seattle, and Portland. They offer winterizing services, had nothing but good experiences with them.
https://nwadventurerentals.com/

[Jim-Dot]

I have a 2021 303rls. Just winterized it for our second winter making sure I followed instructions regarding the Furrion On Demand Water Heater. Can't find anything on what to do with the black tank flush line. In the past I just poured some antifreeze in the line. Is there anything else I should do? So far no problems when it came to using the flush in the spring.
Thanks,
Jim

[Country Campers]

I have a 2021 303rls. Just winterized it for our second winter making sure I followed instructions regarding the Furrion On Demand Water Heater. Can't find anything on what to do with the black tank flush line. In the past I just poured some antifreeze in the line. Is there anything else I should do? So far no problems when it came to using the flush in the spring.
Thanks,
Jim

You could just blow it out with compressed air, 20 psi. should do. This is made so it should drain all contents either to the black tank or back out the inlet where you attach the hose. If there is a belly in the line this may hold water.

Brian