Black tank - small leak into drain pipe.
We've gone out twice so far this year, and both times we have been confronted with the same problem... When leaving the park, I empty the tanks, flush, and then refill a few gallons in the black ta...
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After empty, disconnect the hose, then backflush w/ hose nozzle while working the valves open and close. If that fails, replace seals in valves.
