Originally Posted by Rugged Brown
How is that achieved? I'm assuming by openeing both grey and black gates, the fluids will equalize in the tanks?
As long as the gray tank is full and the black tank is less than half it will work.
Basically, you make sure the end of dump mast valve is closed and open the gray water valve. This fills the dump mast with gray water. Then you open the black water valve for just a few minutes and the flow will be from the mast to the black tank. Close the black tank valve and then the gray valve.
This should transfer 5 or 6 gallons from the gray tank to the black and should extend the time till you have to dump a bit. It will also make sure your black tank is full when you do dump it.
I said this was an emergency procedure since there is always the possibility that solids from the black tank "could" migrate over to your gray tank if not done correctly or you let so much water transfer that there is a back flush into the mast before you can close the gray valve.
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