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Old 08-26-2012, 11:57 AM   #1
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Toilet and sink both into black tank- weird?

I was cleaning my tanks yesterday and noticed the sink in the bathroom also leads into the black tank. Only the kitchen sink and shower go into the gray tank.
Is that normal? Now I know why our black tank fills up so much more quickly than our gray during tailgating.
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Old 08-26-2012, 12:09 PM   #2
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Thinking out loud. I would not know a specific reason to do this other than keep the black tank with plenty of water to avoid build up and drying.

If the install is factory then it most likely was because of location of the tanks and convenience/expense more than design.

If you can fix this easily then shame on who ever did it; excepting of course if there is a good reason. I can't think of one.
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Old 08-26-2012, 12:20 PM   #3
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Eric,

Some coaches have this "feature" and some don't. Some owners wish they had this "feature". Based on a few years of use of our coach, I think I'd prefer it if my bathroom sink emptied to the black tank since our gray water tank fills faster than the black tank, even though the gray tank is larger by 13 gallons. When the gray approaches 100%, the black tank is still below 50%. So, I am one who wishes I had what you've got.

Cheers!
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Old 08-26-2012, 12:21 PM   #4
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No, it is NOT the norm and some 5vers and TT's will do that. The only good reason was to save money. it was obviously cheaper to run the plumbing from that sink into the black tank than to run it all the way over to the gray tank.

Another classic Monaco cost cutting technique.

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Old 08-26-2012, 12:38 PM   #5
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Well, I am not one to climb under and in the tanks to change the piping so it will need to remain.
I can see how it does help to keep water in the black tank if people are not using enough when flushing, which I know most of our guests do not.
I did identify one benefit of this 'feature' though. After emptying the black tank I can then turn the faucet on in the bathroom sink to continue flushing the black tank until the water is clear.
However as I said, most of the use in our RV is the toilet and bathroom sink. the kitchen sink and shower receive a lot less use.
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Old 08-26-2012, 01:35 PM   #6
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"the sink in the bathroom also leads into the black tank"
My Southwind does.
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Old 08-27-2012, 03:55 PM   #7
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A lot of companies do this, not just Monaco. Some do it because of the length of the run from one end of the trailer to the other. Some companies run two grey tanks because it's impractical to run piping because of elevation issues or framing that is in the way.

I kind of like the idea of the bathroom sink draining into the black tank. Adding that additional soapy water is perfect for a black tank.
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Old 08-27-2012, 04:04 PM   #8
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Quote:
Originally Posted by Diplomat Don View Post
I kind of like the idea of the bathroom sink draining into the black tank. Adding that additional soapy water is perfect for a black tank.
I do too. I wish ours did it. Our bathroom and kitchen sinks empty into gray 1, shower into gray 2, and toilet into the black. I have no idea the size of my tanks, but gray 1 stays full. I'm dumping it every other day.
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Old 08-27-2012, 04:09 PM   #9
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I think this is not uncommon. It adds water to the black tank, which makes it easier to empty solids. It also balances out waste water disposal. Unless you run the faucet the whole time you brush, it doesn't add all that much water to the black tank, but reserves the kitchen sink and shower, the big water users, for the grey tank.
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Old 08-27-2012, 06:34 PM   #10
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our winnie drains the bathroom sink into the black tank too. i like it that way.
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Old 08-27-2012, 07:05 PM   #11
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My Thor ACE 29.1 has the bathroom sink draining into the black tank. I think it's just a question of length of pipe run. As a previous poster said, soapy water in the black tank is a good thing.
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Old 08-27-2012, 07:13 PM   #12
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That's how mine works. Sink into black.
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Old 08-27-2012, 07:19 PM   #13
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My Tourmaster has two rear sinks that drain into the black tank. The kitchen sink and shower drain into the gray tank. I was concerned at first, but now am very glad it's that way. I have never had the black tank fill before the gray tank and usually when the gray tank is full, the black is barely over half. I always have enough water in the black tank to ensure a good flush and cleanout when emptying.
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Old 08-27-2012, 07:49 PM   #14
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Quote:
Originally Posted by BFlinn181 View Post
I think this is not uncommon. It adds water to the black tank, which makes it easier to empty solids. It also balances out waste water disposal. Unless you run the faucet the whole time you brush, it doesn't add all that much water to the black tank, but reserves the kitchen sink and shower, the big water users, for the grey tank.
Yup, and I had mine 'changed over' for this 'feature.'

Even in a CG I'll have the gray water just 'flush away.' (Installed pull valve on a 2002 SG Sun-Veg. Well, had it installed.) But #2's ... Oooooo, a different game plan to clean that one out.
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