Black tank Flush
Sticker by the flush hose port says 'drain valves must be open when rinsing blak tank'. Why must they be open as there should be no pressure buildup, or am I missing something?
Forum Discussion
Some guy on this list once told about forgetting to open the valve during the flush and it overflowed out the vent stack. You can picture the result. Actually, I sometimes close my valve and count to sixty then open it again. This allows some water to build up inside the tank and clean better. Just don't forget.
