How do YOU dump your tanks?

I open and Black valve, drain, then dump two buckets (3 to 6) gallons of clean water down the toilet until it runs clear. Close black tank valve.

Then open Gray valve and drain, dump a bucket of water down sink till it runs clear. Close gray valve.

Nothing mystical, they are just holding tanks.

I open grey first to check for 'leaks' then close it
Then open black...run flush or not. Not a every time occurrence
Then a close my downstream added extra valve and open both grey dumps
Greys backflow into black and then I open my downstream extra dump valve and let everything completely drain.

Close off dump valves -----3 tanks and the 1 extra
Add a few gallons back into black and stow hoses/adapters.


Unless using a dump station..then I just dump them all..every valve open and get it done ASAP. Add some water back to black/stow hoses etc and be on my way


But if somewhere that like my sisters place........Macerator. Pump it one tank at a time 75' to cleanout with a 2' rise. Black tank first then both greys and then clean water.

I leave both open. If I have time and water I also connect the black tank sprayer to flush.

Don't think it does actually, just don't forget to close the knife valves.... Never dumped mine in a campground dump station, I have my own in out back (built a secondary septic and leach field)