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12-24-2016, 03:01 PM
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#1
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Member
Join Date: Nov 2016
Posts: 71
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Combining holding tanks
An odd question here but we camp a lot at the state parks and they usually don't have sewer hookups. They do however have real nice bathhouses. The problem we encounter is that we normally use the bathhouses for black water needs but the trailer for most everything else. The result is that the grey water tank fills pretty fast while the black water tank barely gets anything in it. So I was wondering if anyone out there has found a way to basically combine the holding tanks or a way to dump your grey water into your black water tank. This would basically give us enough capacity to make it thru our normal stay without having to go thru the hassle of portable holding tanks or making trips to the dump station. Thanks.
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12-24-2016, 04:58 PM
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#2
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Oklahoma Proud
Join Date: Jul 2012
Location: central OK
Posts: 2,784
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Just get one of these bayonet connection valves and twist it on then you can have both of the tank valves open and equilize the tanks
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12-24-2016, 05:22 PM
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#3
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Senior Member
Join Date: Aug 2016
Posts: 621
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Quote:
Originally Posted by MillerTime
Just get one of these bayonet connection valves and twist it on then you can have both of the tank valves open and equilize the tanks
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And contaminate the gray water tank while you're at it...
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12-24-2016, 05:38 PM
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#4
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Senior Member
Join Date: Aug 2015
Location: Springfield, MO
Posts: 455
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Quote:
Originally Posted by johnbryanpeters
And contaminate the gray water tank while you're at it...
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Agree !! I'm not sure that I would want black water in my gray tank. Now if you have 2 gray tanks, I would give that a try.
__________________
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2017 Cedar Creek 36CKTS
MORryde independent suspension with disc brakes
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12-24-2016, 05:47 PM
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#5
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Oklahoma Proud
Join Date: Jul 2012
Location: central OK
Posts: 2,784
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Quote:
Originally Posted by johnbryanpeters
And contaminate the gray water tank while you're at it...
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I read that the Op stated that he uses bathhouse for his black tank needs.
Honestly all the waste goes out the same pipe. Highly doubt that anyone is using either tank for "potable" uses.
We have always had at least 2 grey tanks, so we used this so we could use both combined.
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12-24-2016, 05:48 PM
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#6
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Member
Join Date: Nov 2016
Posts: 71
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Thanks for that info. I wasn't sure if that would work and the tanks would equalize feeding backwards like that. Just ordered that valve and I'll soon test it out. Thanks.
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12-24-2016, 05:49 PM
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#7
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Oklahoma Proud
Join Date: Jul 2012
Location: central OK
Posts: 2,784
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Quote:
Originally Posted by keith52
Agree !! I'm not sure that I would want black water in my gray tank. Now if you have 2 gray tanks, I would give that a try.
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Really???
Op was talking about using the black tank to hold grey water.
I guess there is no one that pees while in their rv shower ?
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12-24-2016, 05:52 PM
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#8
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Oklahoma Proud
Join Date: Jul 2012
Location: central OK
Posts: 2,784
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Quote:
Originally Posted by PupScrappy
Thanks for that info. I wasn't sure if that would work and the tanks would equalize feeding backwards like that. Just ordered that valve and I'll soon test it out. Thanks.
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Works just fine!
We did it alot before we got a permanent site. The valve we have also has a back-flush fitting that is handy if you dont have a tank flush system.
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12-24-2016, 05:53 PM
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#9
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Member
Join Date: Nov 2016
Posts: 71
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And yes I am not concerned about the grey water cause like it was stated, we use the bathhouses for the black water needs. So much so that I have yet to put any chemicals in the black water tank cause it just doesn't get used. Plus I also don't use the tanks for potable water so it would not matter if they mixed getting dumped or mixed holding, its all going the same place.
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12-24-2016, 05:57 PM
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#10
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Senior Member
Join Date: Dec 2013
Posts: 806
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Quote:
Originally Posted by MillerTime
Really???
Op was talking about using the black tank to hold grey water.
I guess there is no one that pees in their rv shower ?
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Pee in the shower..
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2006 2500HD CCSB 2WD 2014 Crusader 285RET
Nights camped in 2013 - not enough!, 2014 37, 2015 40, 2016 39, 2017 38, 2018 36, 2019 37, 2020 26, 2021 28
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12-25-2016, 07:34 AM
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#11
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Senior Member
Join Date: Jul 2014
Posts: 7,363
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Combining holding tanks
I would think that if your Gray tank Is say 90% full & your black tank is say 10% --if you have the shut off valve--then open both gray & black tank valves for a short bit the pressure will be going from the gray tank to the black tank.
Thus no cross contamination??
On a regular basis when my tanks are full I will dump the black --leave the black tank open when I open the gray tank. Let it flush back into the black tank -close gray-let black flush back out then close it. Then finish gray. Never been an issue for me.
And if it were to cross contaminate I guess I don't see a problem there anyway.
Russell
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12-25-2016, 07:51 AM
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#12
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Member
Join Date: Nov 2016
Posts: 71
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The only way that I would see having a problem with having black water go into the grey water tank would be if the kitchen sink and shower did not have water traps in their drains. Then it would be possible to have fumes come up thru the drains. But otherwise they are just two big plastic boxes hung under the trailer rhat really don't care what's in them. Whatever goes in them is just on a layover on its one way trip to the sewer system. Since all my drains have water traps, I am not worried about fumes. But mainly I'm not worried because like I said we really don't use the black water tank for its intended purpose. It seems from the responses here that they folks who use this method have done so with no issues. I really appreciate the idea for such a simple way to gain more holding tank space. And the last one is unique in controlling where the waste water goes. A method that should work really good. I'll be trying it to see what happens.
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12-25-2016, 08:15 AM
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#13
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Senior Member
Join Date: Oct 2015
Posts: 2,270
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12-25-2016, 08:28 AM
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#14
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Senior Member
Join Date: Jul 2014
Posts: 7,363
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1.5 inch diameter log??? Yes that might "hurt" ---your tank !!
Russell
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12-25-2016, 08:34 AM
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#15
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Senior Member
Join Date: Feb 2015
Location: Southern, IL
Posts: 3,272
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I have been chuckling since post #13. Now after #14, I am laughing for real. I just have this image of the "Yule" log gliding effortlessly between tanks.
As for a 1.5 log, I think I would need stitches...
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Bob & Michelle
2016 Ford F-250 Lariat 4x4
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12-25-2016, 08:36 AM
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#16
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Senior Member
Join Date: Sep 2016
Location: SE Michigan
Posts: 2,024
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Quote:
Originally Posted by CAT-RN
1.5 inch diameter log??? Yes that might "hurt" ---your tank !!
Russell
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OUCH on both ends.....
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12-25-2016, 09:16 AM
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#17
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Senior Member
Join Date: Sep 2013
Posts: 172
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When I was traveling my gray tanks with a garden hose attachment to discharge pipe would spring a leak after dark
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North Ga
2015 40' cls
Never to be moved
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12-25-2016, 09:23 AM
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#18
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Senior Member
Join Date: Oct 2015
Posts: 2,270
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Quote:
Originally Posted by Wobbles
I have been chuckling since post #13. Now after #14, I am laughing for real. I just have this image of the "Yule" log gliding effortlessly between tanks.
As for a 1.5 log, I think I would need stitches...
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I guess I should add;
Unlike some other plumbing if you get my drift, 1-1/2" ABS will not stretch a mile before it tears an inch.
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12-25-2016, 09:56 AM
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#19
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Senior Member
Join Date: Jun 2012
Location: Southern NM
Posts: 9,523
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Quote:
Originally Posted by edt
When I was traveling my gray tanks with a garden hose attachment to discharge pipe would spring a leak after dark
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X2. All the surrounding foliage gets watered well . But I always get a kick out of these threads. They are like fart jokes, always funny, no matter how old you are!
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Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD Duramax
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