Retired VSP wrote:
Thx everyone....I am really surprised at the amount of blackwater sewage that doesn't drain on the initial dump. This has been very enlightening to say the least....and yes the tanks were plugged traveling to the rv center and back home..
If you're not currently using a clear connector at the sewer outlet, you should get one. Drain black tank as you normally do. When you think it's empty, go back inside and fill the toilet all the way up to the rim and flush it. Bet you see more than 1 bowl full come out. Stuff frequently gets stuck at the outlet and needs additional water to push it (and everything else remaining in the tank) through.