Good Black flush "trick" or bad idea?
When dumping my tanks, I've got a new "trick". I drain the black water first and let the hose and tank empty out. Then I leave the black valve open, hold the sewer hose up (above the level of the tanks) and open the grey valve. This lets the grey water rush into the black tank. Before the grey water stops rushing into the black tank, I close the grey valve and lower the hose, thus emptying the black tank again. I'm able to do this "flush" 3 or more times depending on the grey tank level. I leave some grey water for the final hose rinse. I'd estimate I use 5 to 8 gallons of grey each time I do this "flush". I'm careful not to let the tanks equalize allowing black water to the grey tank. I can tell when the greys running low because the gushing (from tank to tank) slows down. It seems to really help clean the black tank. I've got one of those clear fittings so I can see the color of the water. The first time I do it, the water is nasty brown but after a couple of cycles it looks like "clean", soapy grey water. I wish I had a third valve where the hose is connected but there's no room to install one so I just hold the hose up to stop the water flowing to the sewer. Soooooo,,,,, is it a good "trick" or a bad idea?
