Originally Posted by tracker
Thanks for the help. So am I correct in assuming that the greywater does NOT flow into the blackwater holding tank? I just figured that it did since I don't have a separte greywater tank.
Your '69 may be similar to my '64, but I am not certain as Airstream has switched back and forth between above and below floor blackwater tanks over the years and I am not certain what method was used in 1969. If your blackwater tank is below the floor, there is a method by which you can force the graywater to back-up into the blackwater tank. The procedure is to place a solid wasted cap over your dump valve and open the blackwater tank dump valve . . . the graywater will now be diverted into the blackwater tank. There are two downsides to this methodology . . . the first is that your blackwater tank will fill quickly as it is likely less than 20 gallons . . . possibly as small as 13 gallons . . . the second is that when it comes time to dump the tank, it is necessary to close the blackwater tank gate valve which traps approximately 1/2 gallon of wastewater between the gate valve and cap that must be dealt with when you remove the cap from the dump valve.
Good luck with your coach!