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Old 07-06-2016, 03:20 AM   #1
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black waste flush 8289ws

is the tank flush a bit like a jet wash inside the tank?
what is best to flush it out? leave tank closed or open?
thanks
ali
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Old 07-06-2016, 03:57 AM   #2
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is the tank flush a bit like a jet wash inside the tank?
what is best to flush it out? leave tank closed or open?
thanks
ali
Yes Kinda, I always leave it open and watch my clear elbow, then when I see just clean water I will close it for a minute and let it build up then pull it again. Then I ready to rock and roll again.....
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Old 07-06-2016, 05:05 AM   #3
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Originally Posted by hitch hiker View Post
is the tank flush a bit like a jet wash inside the tank?
what is best to flush it out? leave tank closed or open?
thanks
ali
ALWAYS leave the tank OPEN (don't ask me how I know this )

When I dumped our tanks, I would do the black-gray dump process and then I would turn on the tank flush (yes it is just like a jet wash - a spinning arm at the top of the tank) and let it run until the water ran clear every time I dumped. In the 3 years we owned our Rockwood, we never had a problem with the sewer system.
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Old 07-06-2016, 06:31 AM   #4
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We dump at home with a Flojet.



I'm still working on the procedure but here's what I've got so far (yes, it's detailed):
  1. Connect the Flojet and the drain hose
  2. Drain the black tank with the Flojet
  3. Connect the flush hose to the black tank rinser
  4. Turn on the flush hose
  5. Allow the black tank to fill for 30 seconds
  6. Drain the black tank with the Flojet
  7. Repeat steps 5 and 6 until water drains clear
  8. Allow the black tank to fill for 30 seconds
  9. Close the black tank valve (always good to have a little water in there)
  10. Turn off the flush hose
  11. Connect the flush hose to the Flojet flush port valve (as pictured above). This is a one-way valve that allows water in, but not out
  12. Turn on the flush hose (leave the flush port valve closed)
  13. Drain the galley tank with the Flojet
  14. Open the Flojet flush port valve
  15. Allow the galley tank to fill for 30 seconds
  16. Close the Flojet flush port valve
  17. Drain the galley tank with the Flojet
  18. Repeat steps 13-16 until water drains clear
  19. Allow the galley tank to fill for 30 seconds
  20. Close the galley valve
  21. Repeat steps 13-20 for the bathroom grey tank
  22. With all tank valves closed, open the Flojet flush valve port
  23. Immediately drain the clear water (otherwise the flushing water will pressurize the pipes and leak out of the valves, which can't be good)
  24. Keep flushing and draining for 30 seconds to clean out the drain hose (the Flojet will retain some water - no worries)
  25. Turn off the flush hose
  26. Close the Flojet flush port valve and disconnect the flush hose
  27. Open the Flojet flush port valve to allow air inside
  28. Drain the remainder of the clear flush water
  29. Disconnect the drain hose
  30. Disconnect the Flojet

I know it looks complicated but it's really not!
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Old 07-06-2016, 06:43 AM   #5
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JD could this be done from a I phone also for remote use? Youroo!!
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Old 07-06-2016, 09:04 AM   #6
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Open the valve while using the tank flushing system. After the water becomes clear, close the valve let and let the tank fill for about a minute, then open the valve again. After you do this make sure that you leave a small amount water in the black tank so that the bottom of the tank does not dry out.
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Old 07-06-2016, 09:17 AM   #7
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JD could this be done from a I phone also for remote use? Youroo!!
I wish! For now I just use the smartphone's stopwatch app.
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Old 07-06-2016, 01:12 PM   #8
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Barstorm, you say leave a little bit of water in the bottom of the tank so it doesn't dry out.....are tanks known to dry out. I haven't heard that before.

I have the black tank flush and love it! Camper is 4yrs old and my gauges still work and don't miss read.
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Old 07-06-2016, 01:14 PM   #9
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All the evidence points to the use of a clear elbow and anything the shoots a jet of water up into the tank from the valve end does and proves nothing. The blank tank flush devices set into the tank itself do some good, but why do we care so much? I agree some water left in the tank, making sure the "black pyramid" does not form are reasonable things, but cleaning the black tank so methodically? I really don't get it. To each their own and since it causes no harm to anyone else, more power to you!
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Old 07-06-2016, 01:28 PM   #10
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All the evidence points to the use of a clear elbow and anything the shoots a jet of water up into the tank from the valve end does and proves nothing. The blank tank flush devices set into the tank itself do some good, but why do we care so much? I agree some water left in the tank, making sure the "black pyramid" does not form are reasonable things, but cleaning the black tank so methodically? I really don't get it. To each their own and since it causes no harm to anyone else, more power to you!
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