JRscooby wrote:
As for connecting the tanks. Once you do that you have no grey water, it is all black, unless the black can't back into the other tank. And that connecter will be a good place for blockage, hard to clean, and real stink to grow.
Who cares if it's legally black water?
Gray water often smells worse, so no real stink concern.
Assuming everything drains to a single point, a simple and cheap solution is to buy a temporary twist on valve.
https://www.amazon.com/Valterra-T58-Twist-On-Waste-Valve/dp/B000BGHYJS/ref=asc_df_B000BGHYJS?tag=bingshoppinga-20&linkCode=df0&hvadid=80401840125241&hvnetw=o&hvqmt=e&hvbmt=be&hvdev=c&hvlocint=&hvlocphy=&hvtargid=pla-4584001431142158&psc=1
Attach the temporary drain valve and leave closed.
- After the gray gets full, open the gray valve.
- Then open the black valve
- (again keeping the temporary valve closed)
- The greater amount of water in the gray tank will flow down and then back up into the black tank.
- When you do get around to dumping, close all the valves, attach the hose to the temporary valve, then open the black followed by the temporary valve...once empty open the gray valve.