[footz1941]

Close both grey valves before opening black water valve. No cross contamination Open black water and let it run until clear. Close valve and set alarm on my phone for 10 minutes so I do not get distracted then open black water again Usually do twice Shut off rinser and open grey valves. Have did this for years with no problems and using no chemicals. Only do this when hooked to sewer not when using a busy dump station