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Old 01-14-2022, 08:12 AM   #1
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What order?

2017 Winnebago Vista lx35 dual toilets, ( bath and a half )My question is when draining black tanks do I drain one be fore the other? And if so which one? Just bought used ,not been out to travel yet.
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Old 01-14-2022, 09:38 AM   #2
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I have two black tanks and two gray tanks.

Here is my procedure:

1. Drain half bath black tank.
2. Drain half bath/kitchen gray tank.
3. Drain back main bathroom black tank.
4. Drain shower gray tank.
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Old 01-14-2022, 10:17 AM   #3
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Drain when full (at least 3/4 full)
Drain a little grey to check that there are no leaks....then close grey
Drain black-----followed by grey (helps 'rinse' black out of drain line/hose)

When done...add couple FULL toilet bowl flushes back into black tanks

Same with grey...full sink drained into grey tanks.
*wet bottoms keep 'stuff' from sticking
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Old 01-14-2022, 10:36 AM   #4
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Old 01-14-2022, 10:55 AM   #5
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Nice little coach! Yes, the black tank, then the gray. Close the black valve before opening the gray valve. Make sure both valves are closed before you remove the cap and before you get underway. It helps to have a clear connector at one end of the hose so you can see it running and know when it's done.



As others have said, when you're hooked up and ready to drain, you can open the gray for a moment to let some gray come down the hose. That will let you know if there's a leak before you start dropping the black. Some people keep both valves closed when they're parked, some just the black. If you don't keep the black tank "wet" it will start to build up solids.


Whatever you do, don't watch the scene from RV where Robin Williams' character drains the tanks. This one:
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Old 01-14-2022, 03:41 PM   #6
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OK. I'll say it. Beats the crap out of me!
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Old 01-15-2022, 04:02 AM   #7
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The black tanks could care less which one goes first as long as they both go before the grays.
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Old 01-15-2022, 04:27 AM   #8
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I have the same RV. It doesn't matter witch black tank you drain first. I do the half bath tank first only because of the macerator pump takes a little longer. Then the main bath and always flush both tanks with the tank flush system.
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Old 01-15-2022, 09:44 AM   #9
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Quote:
Originally Posted by Toby Dog View Post
The black tanks could care less which one goes first as long as they both go before the grays.
I was thinking this myself at first. But then since I don't have but two tanks, got to thinking there may be a more specific procedure for the OP's rig. The coach's manual might give some advice if this happens to be the case.
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Old 01-16-2022, 03:55 AM   #10
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No guarantee that the seller drained the tanks before you bought it either. Go practice your technique at a dump station before you travel the first time. Don't be a Robbin Williams.
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Old 01-16-2022, 04:54 AM   #11
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Only Robin Williams could do that so well.
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Old 01-19-2022, 01:29 PM   #12
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I don't think it matters which black tank gets dumped first, I used to dump our two blacks together...then dumped the two grays at the same time, with no problems. Just made sure I had good slinky connections at the RV and at the CG sewer connection. ('05 HR Vacationer DBD...2 Blacks and 2 Gray tanks, 40 gal ea.)

Being a new to you RV, I'd definitely buy a good quality dump hose...don't trust the one that came with the coach. I did and it didn't turn out well...
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Old 01-22-2022, 01:29 PM   #13
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Odor is going to be close in both with a slight edge on the black. I dump black first because i don't want any little presents left in my sewer hose when the water is gone
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Old 01-22-2022, 02:12 PM   #14
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Quote:
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The black tanks could care less which one goes first as long as they both go before the grays.
Sounds to me like you're saying they don't give a crap except they do....
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