RV Black and Gray Tank: Dump, Maintain, Repair

Black tank maintenance

Task	Action	Stop
Before travel	Dump the black and gray tanks before traveling.	Stop if the tanks are full and no dump station is available.
Valve timing	Keep the black valve closed until the tank is at least 3/4 full.	Stop if the valve leaks.
Deodorant	Add deodorant after dumping and before use, unless winterizing.	Stop if the tank is frozen.
Dump order	Dump black first, then gray, to rinse the outlet and hose.	Stop if the hose leaks.

Task	Action	Stop
Dump order	Dump gray after black.	Stop if the gray valve will not open.
Level and station	Level the RV and use an approved dump station.	Stop if no approved station is available.
Hose	Remove, clean, and store the sewer hose; close the dust cap.	Stop if the hose is damaged.
Leaks	Check all waste fittings for leaks before each trip or storage.	Stop if a fitting leaks.

Check	Action	Stop
Waterless trap	Remove the waterless trap before using mechanical drain-cleaning devices.	Stop if the trap is damaged.
No-drain branch	Check that the dump valve is fully open and the hose is not blocked.	Stop if the valve is damaged.
Leak	Stop on a leaking waste fitting or damaged dump valve.	Stop and use qualified service.