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Old 07-21-2020, 10:27 PM   #1
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Sink Bubbling while in shower

I've got a 2019 Rockwood ultralite 2706. Just noticed tonight my bathroom sink is blowing water out of the drain every once in a while I'm in the shower. Grey tank is getting full according to the panel. Wondering what it is. It's stinks like rotten eggs and makes a mess.
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Old 07-22-2020, 04:44 AM   #2
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Welcome from New Jersey, most likely that tank is full ,Try emptying it b4 the next you shower and see what happens.
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Old 07-22-2020, 04:48 AM   #3
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The tank vent might be plugged.
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Old 07-22-2020, 04:59 AM   #4
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Probably the tank vent.
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Old 07-22-2020, 05:43 AM   #5
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It may Just (hopefully) be the tank vent clogged with a wasp nest or something else, but it could also be (hopefully not) that the drain and/or the vent (which could be one and the same if your shower is wet vented through the sink drain and the sink vent is also serving as your tank’s vent) entering the tank is pushed too far into the tank. If this is the case, when the water in the tank gets up to the level where the bottom of the pipe is, the vent is no longer venting to atmosphere. What you have described would have nothing to do with an air admittance valve (AAV), so don’t waste your time and money replacing that. Your issue is an atmospheric venting problem.

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Old 07-22-2020, 07:01 AM   #6
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The tank vent sticks down into the tank from the top. It should only extend a little way down as once it gets below the line of the liquid, it does not work well. The vent pipes have been known to slip down over time and travel and cause what you are seeing. You can check this by going on the roof and removing the vent cover and checking the vent pipe (PVC). A quick field fix is to dump the tank as sooner.
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Old 07-22-2020, 07:50 AM   #7
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Quote:
Originally Posted by Flybob View Post
The tank vent sticks down into the tank from the top. It should only extend a little way down as once it gets below the line of the liquid, it does not work well. The vent pipes have been known to slip down over time and travel and cause what you are seeing. You can check this by going on the roof and removing the vent cover and checking the vent pipe (PVC). A quick field fix is to dump the tank as sooner.
But not all gray tanks have a dedicated vent and use the vent off of the kitchen sink or lavatory instead.

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Old 07-22-2020, 01:21 PM   #8
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Quote:
Originally Posted by fonzie View Post
The tank vent might be plugged.
My first thought.
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Old 07-22-2020, 02:04 PM   #9
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My bet is your great water tank is getting full...
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Old 07-22-2020, 05:50 PM   #10
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What everyone said plus, to help with the smell start using some Gray Tank treatment. Tablets or pouches that will help dissolve the soap scum that accumulates in the tank and eventually ferments, giving off a stench like a septic tank.

These treatments also contain a odor suppressant that gives off a citrus aroma as a rule.

Add one after emptying the tank, just like for a Black Tank.


I've used these with good effect. About $0.90 each and add to a drain after dumping the tank.

https://www.amazon.com/Walex-TOI-917..._t1_B0006H92QU

There are others that I'm sure work just as well.
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Old 07-22-2020, 10:16 PM   #11
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Quote:
Originally Posted by Caylin2020 View Post
I've got a 2019 Rockwood ultralite 2706. Just noticed tonight my bathroom sink is blowing water out of the drain every once in a while I'm in the shower. Grey tank is getting full according to the panel. Wondering what it is. It's stinks like rotten eggs and makes a mess.
Time to go dump the gray water.
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