Black Holding Tank slow to drain...
Our Black Holding Tank is slow to drain. Can this be caused by a bad Air Admittance Valve or a clogged vent cap or both? The tank dumps fine at first, but it eventually backs up and then very slowly...
Forum Discussion
kgie1217 wrote:
Sounds like you have a build up of waste (ie, toilet paper, feces). Have you done a flush yet?
This.
2oldman wrote:
You can verify if it's air intake by holding open the toilet.
And this.
