Plumbing diagrams

[Lcpoulson]

I have a Prowler 212RD that the black water fills fast and the grey only fills if using the shower. Any ideas on if the kitchen sink drains to the black water, that is the only reason I can come up with for it filling so fast.

 

[rhodies1]

No doubt your bathroom sink drains into the black tank. This is something that the manufacturers have started to save on installing another tank. Drain your black tank and dump a gallon of red food coloring down your bathroom sink. Then re- dump your black tank and watch the liquid in the clear elbow to see if it red. If so then that’s what you have. Sink into black tank.

 

[taskswap]

It's a hack. But this is one of those rare times there's a silver lining. Most black tanks fill slowly and you can get p*** pyramids and other problems. It's always a challenge making sure you have enough water in there to get good mixing and thus a good dump from that tank. There's an old-trick when washing dishes or cooking pasta to dump the excess water in your toilet instead of down the sink just to help this. You do you but if yours isn't filling up TOO fast, maybe leave it?