black tank rinser

Cummins12V98 wrote:

avvidclif1 wrote:

Cummins12V98 wrote:
This setup works GREAT!!!

I leave my grey tank open but about once every month I close it a couple days before I dump the black tank so it has a chance to loosen anything on the bottom of the tank.

So lets say it's a black and grey flush day.

I open black and grey valves at the same time and turn on both valves on the "Y". I Have a clear 45 elbow at the RV's sewer connection then the sewer hose after that. I observe the water turn clear and close both tank valves leaving the water run for 6-8 minutes. SET THE TIMER ON YOUR PHONE !!!!!!!

Open both tank valves let run til clear, close and set timer, open til just the water is running thru clear from the hose. Now close the black valve. Let the water run for about one minute. Close both valves at "Y".

The black tank will easily go one week so I usually do the deed on Sundays.

The dropping the "BOBM" is not a bad idea I may do this also. MeAgain's method.

The only problem I have with that is using a timer. I tried that, run for 5 min, and thought it was great. Then I got one of the inline water meters. 5 min gave abt 15 gal most campgrounds. I like to at least half fill (20+ gal) after the first dump.

8 minutes @ 5 GPM is 40 gallons. But the fact is I only do the grey while doing the black and there will never be that amount of water. My black is 50G and grey is 75G.

Adjust as needed.