- Joined
- Nov 2, 2019
- Messages
- 1,255
- Location
- Fulltiming
- RV Year
- 2022
- RV Make
- Newmar
- RV Model
- London Aire 4551
- RV Length
- 45
- TOW/TOAD
- Yukon Denali
- Fulltimer
- Yes
Leaving the black valve open is not recommended as it can cause pyramiding. You may indeed need a very good cleaning.I’ve almost always left the black tank valve open.