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
You might want to check with other RVers in the park and ask if they are having the same problem, if not, it is probably just the sewer drain at your site.
