For the 5 years I have been on the road when I backwash my black tank I hook up the outside shower to the backwash,
Last week when I turned the water on it leaked out where these lines went up in the ceiling of my basement:
I shut the water off, cleaned up the mess, then turned the water back on. No leaks the rest of the time I cleaned the black water tank.
Next time I cleaned the tank, the same thing happened. I put a camera up the whole where the leak came from:
Could not see any disconnected hoses, or where the water was coming from: