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Old 09-08-2015, 06:01 PM   #1
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Has anyone tried this?

I was reading a post on emptying gw tanks and I thought of this. If you emptied your bw, put the cap back on, and opened all 3 valves would the gw tanks fill the bw tank and kind of give it a rinse? I know you would want a bayonet valve to eliminate a mess but would this work?
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Old 09-08-2015, 06:33 PM   #2
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Just a thought, I think you would stand a good chance of getting some of that junk from your BW into your GW tank/tanks.
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Old 09-08-2015, 07:17 PM   #3
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Good point.
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Old 09-08-2015, 08:21 PM   #4
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But if you parked with the grey water uphill, would it work!?! Hummm
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Old 09-09-2015, 09:06 AM   #5
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On our last rig I had a bayonet valve on the outlet and I actually tried that. It doesn't work as well as you may think. It hardly gets any water into the black tank unless your grey tank(s) are completely full.

I won't say that it doesn't work at all, but a tank flush works much better and is actually faster than trying to rinse the BWT with GW.
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Old 09-09-2015, 09:24 AM   #6
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I do this occasionally when dry camping.

I installed a shut off valve on the dump mast exit so that I can dump half a full gray water tank into the usually mostly empty black tank.

The procedure I use to prevent black from leaving the BW tank:

1) Close the mast shutoff - IMPORTANT
2) Open the gray tank valve - (this will fill the dump manifold)
3) Open the BW tank dump valve - (water should only flow from the GW to BW)
4) Only transfer about 1/4 of the GW volume (depends on BW level) to prevent overfilling the BW which will defeat the purpose of doing this.
5) Close BW valve FIRST
6) Close GW valve and REMEMBER the manifold is full of GW.
7) At Dump Station, HOOK UP HOSE FIRST before opening mast shutoff.
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Old 09-09-2015, 09:34 AM   #7
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Kinda doesn't make sense to do any of that when you have a black tank flush. And if you don't, then just fill the BT with water from toilet after dumping.
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Old 09-09-2015, 09:46 AM   #8
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Quote:
Originally Posted by Rugged Brown View Post
Kinda doesn't make sense to do any of that when you have a black tank flush. And if you don't, then just fill the BT with water from toilet after dumping.
Terry, I think you missed the OP's question (or I did....)
No black tank flush when boondocking.
No dump station handy or you can't move till the event is over (NASCAR).
Gray full and Black mostly empty.
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Old 09-09-2015, 09:49 AM   #9
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Hmmm; looks like it was me.

With water pressure (and no end valve) what he was talking about is not good.
The manifold would be FULL. How do you hook up the hose?
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Old 09-09-2015, 10:04 AM   #10
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Quote:
Originally Posted by Herk7769 View Post
Hmmm; looks like it was me.

With water pressure (and no end valve) what he was talking about is not good.
The manifold would be FULL. How do you hook up the hose?

Experienced a messy conclusion to that very scenario myself. That is why I always leave my transparent elbow on the end of the cleanout.
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