I've noticed on our last trip (a couple of days ago) that my black water did not completely drain when I was at the dump. I let it drain for at least 15 minutes before closing the tank and opening the grey water. I went the the RV shop for some cleaner and it seems to have broken everything down when I checked the gauges which read empty. After looking down the drain I noticed that it was still at a high level (this was after we returned home). My plan is to go to the storage spot to dump again and with any luck it will clear out.
Has anyone experienced this same problem? Please I need all the help or suggestions I can get.