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Old 03-17-2015, 12:25 AM   #1
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Gray overflow to black?

We have 1 gray tank and 1 blank tank, both 36 gallons. We typically will fill the gray tank well before the black tank. Having a practical means of shifting some gray drainage into the black tank would be useful, but I'd rather not do that manually with buckets, trekking it into the toilet.

In another thread I saw a reference to plumbing mods to allow shifting some gray water overflow to the black water tank. I used search and browsed lots of thread but can't find any mention of such a modification. Can someone point me to a description?

Thanks
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Old 03-17-2015, 08:35 AM   #2
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no mods yet i just take a 5 gal bucket and either dump the gray down my potty if boon docking or down the bath house if camping. i would be interested in maybe adding a mod if it did not take major changes
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Old 03-17-2015, 08:53 AM   #3
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Water and ?? seeks its own level! Trying to balance both tanks is a (Messy) idea with very Little gain! Youroo!!
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Old 03-17-2015, 09:03 AM   #4
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I'm skeptical, too, but am willing to consider the option if someone else invented a way. There are geniuses among us.
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Old 03-17-2015, 09:24 AM   #5
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I don't see anyway to cross-connect the two tanks without contamination of one to the other ie black into gray. The bucket method may be low tech but it's the best solution.


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Old 03-17-2015, 11:30 AM   #6
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When dumping full tanks I briefly hold both camera open but only after the black tank is fully drained and the gray tank is still full. I then close the gray valve promptly and allow the black tank to drain again. After that I close the black valve and don't allow communication between the two. Any further rinsing of the black tank is by way of a clear segment with attached hose.
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Old 03-17-2015, 12:20 PM   #7
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The most practical way would be to simply install a connection hose from the grey to the black. As was pointed out, water will seek its own level. You therefore need to pump the grey water up and out of the tank and then deposit it into the black. This is really a simple Mod. Just need a bit of hose and a small pump.

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Old 03-17-2015, 01:27 PM   #8
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Really don't want to cross connect the gray and black. Keep two separate systems. GOD forbid somehow a cross connect and blocked black tank sewage will flow up into the shower, sinks etc.
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Old 03-17-2015, 01:45 PM   #9
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Warnings aside, I've read of other folks using a valve at the sewer connection and using it to equalize the tanks:



I've never done it, though.
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Old 03-17-2015, 02:45 PM   #10
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I do something like that by opening the gray valve after the black tank is empty but only if the gray tank is relatively full, to reduce the likelihood of backwash.
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