Draining black tank into grey tank..... - Fiberglass RV


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Old 04-17-2017, 06:02 PM   #1
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Draining black tank into grey tank.....

May seem crazy idea but is this a good thing to do to expand time between trips to the dump station?

Let me elaborate lol. If one showers in the campground shower and washes dishes and hands in a sink bowl then waters the trees when bowl is full then the 32 gallon gray tank stays empty.

On to the toilet and if it is only used for #1 ONLY but has some TP in it from the wife (sorry if I'm too much info but it's needed for the subject lol) then on a long trip the 8 black gallon tank can fill fast.

So if I pull both valves then essentially the black tank will drain into the grey tank. Then we can empty the black 5 times before dumping. This is due to gravity with black tank higher than grey. I realize when I do eventually drain that some will spill out as soon as I uncap.

What's the consensus? Is this crazy? Will the TP cause an issue sticking in grey tank? What am I missing that makes this a bad idea? The only thing I can think of is maybe it's a better idea to put the tp In a trash can to keep everything 100% liquid. Have u done this?
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Old 04-17-2017, 06:45 PM   #2
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Remember that once you put black water in your grey tank from that point forward you have 2 black tanks FOREVER .
I have dumped grey water around trees / vegetation where allowed . Once your grey tank is contaminated that option is gone.
You are free to do as you wish but be aware of the long term affects .
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Old 04-17-2017, 06:57 PM   #3
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And you now have the SMELL coming up through the S traps once the water evaporates during non use of the camper. Your Sink and Shower.

I would never do that.
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Old 04-17-2017, 07:04 PM   #4
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Gee, I think that idea stinks - excuse the pun, it is intended. I could not do this in the Scamp even if I wanted, because the drains are separate. I drain the black tank first, then the grey, which rinses the slinky hose and from that point it is easier to handle and stay away from the bad stuff. You do not want anything in the black tank that does not dissolve reasonably well, but you already know the options.
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Old 04-17-2017, 07:09 PM   #5
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I don't know if it is possible in a Scamp, and think it is a poor solution anyway. A portable blue boy is a much better idea, as is just mostly using the campground facilities (what we do). Except for night time potty breaks of course.
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Old 04-17-2017, 08:45 PM   #6
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Not something I would do. Beside fouling your gray tank, the thought of the next camper being in the vicinity of your black tank dumpage (even if only diluted liquid and TP) is cringe worthy. Use available rest rooms and/or portable container. Mike
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Old 04-17-2017, 09:40 PM   #7
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I thought about your idea, as well as a reply. I will not resort to potty-talk, or say something nasty, but I did think of some nasty things to say about it. Lets just leave it at just go to a dump station when you see the need.
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Old 04-17-2017, 09:50 PM   #8
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That idea might be ok IF you disconnect the sink and shower drains and seal off those openings to the gray tank. You want to head off any chance of bacterial contamination to the trailer's interior. Otherwise I'd have to call it a pi**-poor idea. (pun intended, couldn't pass it up!)

Are you planning to own that Egg forever? If you do store black tank contents in the gray tank, you will have to hide that fact from any future prospective purchasers; I for one would never want to buy it! IOW, resale value is something to consider, too.

If you really need that much black... or should I say, yellow? storage, I have to wonder if you're drinking waaaay too much coffee! Traveling alone, a little ol' porta potty tank can hold about 10 days for me, if I can stand the smell that long.
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Old 04-17-2017, 10:25 PM   #9
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Blue tote is the way to go if you don't want to do special trips to the dump station.
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Old 04-18-2017, 05:39 AM   #10
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Looks like a resounding NO lol! OK, I was just curious of thoughts on it but I won't do it for all of the reasons stated in the replies. Reason I asked is we went on a two week vaca last year and hope to do it this year. The place we have in mind has Water but not full hookups. I like the idea of the tote. Since our black tank is only 8 gallons then I won't need a huge tote.

Thanks for all the good info and things I'd not thought of. This site is great!
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Old 04-18-2017, 06:02 AM   #11
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On my modified Scamp I added plumbing between the two tanks, but my 8 gallon black tank is under the floor at the same level as the gray tank.
I also have a maceration pump in the system and a Hevpro valve in the sink.
I often join the two since now a days you are not allowed to dump gray water on the ground either.
I have 1 1/2 inch piping and two extra valves one from each tank.
These feed the pump for disposal.
Each tank can be drained separately and I normally keep them isolated and pump out the Black tank and then flush with the gray.
My problem is not the black but the gray fills quickly.
Each tank also has it's own 3" valve and cap as well and can be handled like a regular Scamp.
I am thinking about adding a third 3" valve and cap where the tanks join.
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Old 04-18-2017, 06:28 AM   #12
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It is an interesting concept. My home uses a septic tank and only has one tank. The only thing between me and that is my sink p-trap so it is an interesting thought.

BUT like someone mentioned here the vent is a concern the more I think about it! My grey water vent is right on the side of the egg directly in campsite area! Yikes! So for that alone I'll have to keep em separate. I'll look into the blue tote. I just didn't want to lug one in the truck. Maybe I can rig it to my back bumper.
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Old 04-18-2017, 07:12 AM   #13
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This is the first time I noticed that the forum opinion is unanimous - honest! Just bring up tire pressure, towing speed, weight distribution, freezing temperatures, solar stuff, ...
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Old 04-18-2017, 07:36 AM   #14
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Originally Posted by JWScarab View Post
I'll look into the blue tote. I just didn't want to lug one in the truck. Maybe I can rig it to my back bumper.
Perhaps in a luggage rack if you have a bike rack receiver on the rear bumper of the trailer.
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