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Old 11-04-2015, 02:54 PM   #1
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My bathroom sink drains into the black tank?

We were out a couple of weekends ago in our new (as in first ever) TT, a Rockwood 2715VS Ultra-V. This model has a front bath in the v-nose with two sinks. Two grey tanks on this model, one up front and one midway for the galley.

I thought we had plenty of room in the black tank according to the sensor but noticed that the waste was very far up the pipe for the toilet. The front grey tank didn't have much in it, so I thought I'd run some additional water to help flush the slinky better. I started adding water to both sinks and set back with a beer to watch the front grey tank sensor.

My wife happened to go into the bathroom and called out that one sink was plugged up. Sure enough, the sink closest to the toilet was backing up. Then to my horror, I realized the water was brown. I drained the black tank and, sure enough, the "plugged" sink drained. I disinfected the sink after it was empty.

I talked to my neighbor in the site next to me about this. Mark has been camping for 30+ years. He and Betty Jean were in a Rockwood 5er. Mark didn't think it wasn't right that a sink drained into the black tank.

After getting back home I did a Google search and discovered its not unheard of for grey water and black water to drain into one tank. Apparently pretty normal on boats and on some RV's.

My question is does it seem weird that Forest River would add two grey tanks, 37 gallons each, and then route one sink into the 37 gallon black tank? I kinda assumed that ALL the grey water would route into the grey tanks given I have two of them.

I realize Forest River could save the cost of the PVC to route the sink furthest away from the front grey tank into the closer black tank, but it just strikes me as odd.

Just looking for the groups thoughts and experiences before I place a call to Forest River customer service.

Thanks!

Bob
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Old 11-04-2015, 03:17 PM   #2
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Perfectly normal, I've had it when piping routing dictates it and it also extends gray tank time between dumps. Just maintain the trap in good order!
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Old 11-04-2015, 03:43 PM   #3
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<snip> Just maintain the trap in good order!</snip>
Thanks for the quick reply Vince!

Short of making sure I keep water in the trap to prevent odors from the black tank, anything else you'd recommend I do?

Thanks again!

Bob
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Old 11-04-2015, 07:05 PM   #4
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The only other thing comes to mind is use a tank "wand" available at CW or Walmart regularly to keep the tank gage probes clean and you can trust the reading. Very important with occasional use. Happy camping!
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Old 11-04-2015, 07:21 PM   #5
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I'm wondering how you can get water backing up into the sink, which should be higher than the toilet, without backing up into the toilet first. Seems like something else is also going on.
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Old 11-04-2015, 07:27 PM   #6
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Our previous trailer was plumbed just that way, bathroom sink grey water was directed to the black tank! Was told by the dealer that the manufacturer designed it that way so when the black tank was being dumped there would be more liquid than normal to make dumping black tank more efficient! I.E. a greater slug of water to move out the solid waste!
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Old 11-04-2015, 07:29 PM   #7
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I'm wondering how you can get water backing up into the sink, which should be higher than the toilet, without backing up into the toilet first. Seems like something else is also going on.

Say the tank is full to the top but not overflowing and the toilet valve is closed and sealed. Then you wash your hands using normal water flow, maybe running the hot until warm water comes out...right? As soon as the P trap spills over the drain fills up and right into the sink.
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Old 11-04-2015, 07:31 PM   #8
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I'm wondering how you can get water backing up into the sink, which should be higher than the toilet, without backing up into the toilet first. Seems like something else is also going on.
My guess was the gate valve on the toilet made a very good seal. Nothing back up into the toilet bowl.

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Old 11-04-2015, 08:34 PM   #9
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Say the tank is full to the top but not overflowing and the toilet valve is closed and sealed. Then you wash your hands using normal water flow, maybe running the hot until warm water comes out...right? As soon as the P trap spills over the drain fills up and right into the sink.
I understand that, but highly doubt the water would be turning brown if the water going down the drain is relatively clean. Seems odd that something would come UP from the tank when clean water is going down. Not saying it can't happen, but it seems highly unlikely to me.

Especially when the OP said his wife "happened to go into the bathroom," which sounds like NOTHING was really going on. Maybe the tank warmed up, the water expanded, and forced its way up the drain. That I might believe.
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Old 11-04-2015, 08:41 PM   #10
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I would be looking into the possibility of re-routing the sink to another drain that emptied into a grey tank.
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