Black Tank Level Rises without Use?
We are parked in my brother's driveway under shore power, city water but no sewer hook-up. When we arrived, our black tank was at 75% so we've been using his facilities. After two days, the level has risen from 75% to 94%. Can anyone explain how this is happening?
We leave tomorrow and I'd like to avoid hitching up to dump the tank this afternoon. Also, how much reserve do we have above 100%?
We have a new 2017 FC 25.
2006 Cayenne S with V8, air suspension, factory tow
2017 FC25 rear bed