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Old 12-03-2014, 04:52 PM   #1
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Plumbing Issue

Hello, everybody
I need some expert advise!
I just discovered that when I use my kitchen sink the water backs up in my shower and it takes forever to drain. I have used RV chemicals, drain liquid, and the RV drain wand that you use down the toilet to soften things up down there but these solutions did not work. I was then using the bathroom sink to get rid of dirty water but now it is backing up in the shower. I do not know where the clog is but would like to figure out how to resolve this very annoying problem. My next thought was to put hydrochloric acid down all of the drains but that may harm the pipes? Any ideas?

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Old 12-03-2014, 04:59 PM   #2
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The only time I see water back up in the shower is if my grey tank is full. Have you dumped the grey tank?

To be able to help, folks will need to know what kind of rig you have.

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Old 12-03-2014, 05:00 PM   #3
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Sounds like your grey water tank is full! Make sure it is empty before you go any further.
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Old 12-03-2014, 05:11 PM   #4
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You might try pouring some boiling or very hot water down the sink. If there's grease build up in the line, it might help loosen it up.
The lines should all be plastic so I doubt acid would hurt, but I'm no chemical expert so I couldn't comment on that.
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Old 12-03-2014, 05:50 PM   #5
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A friend had the same issue. Turns out his drain pipe extended too far into the gray tank. When the water level reached the bottom of the pipe, more water could not enter the tank faster than air was forced out the roof vent. Made for very slow sunk drain.
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Old 12-03-2014, 06:26 PM   #6
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Old 12-03-2014, 06:36 PM   #7
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I think it is empty, that is I pulled the handle to let it out and nothing comes out. But maybe the clog is there and will only let some water out?
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Old 12-03-2014, 06:42 PM   #8
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OK, run 10 gallons of water down your shower or sinks drains and then pull the lever to empty the water.

Either it empties quickly or it doesn't. You've ID'd the area of blockage.

IF it empties properly, you've eliminated the Gray as the trouble-maker.

Pour 5 gallons down the toilet and repeat the drill. Let us know the results.
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Old 12-03-2014, 06:42 PM   #9
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I am going to try boiling water and see if it works.
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Old 12-04-2014, 10:26 PM   #10
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The rod may not be attached to the valve blade anymore. The reason no water comes out when you pull the handle.
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Old 12-05-2014, 05:55 AM   #11
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Hi Saturn,

Have you been leaving your grey valve open all the time? If so, then you are badly plugged up with grey sludge. Now you can check if you have a vent problem by climbing up on the roof to see if the vent has slide down and also make darn sure the grey handle rod is still connected to the dump valve. If those areas look normal then your just plugged and need to do a lot of Back-Flushing. If you are not near an area that offers mobile Hydro-Cleaning then there is a device called a "Flush King" offered by Camping World that does a great back-flushing. The cost is about $59.00
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Old 12-05-2014, 12:35 PM   #12
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I have a clear tube with a hose attachment and opened one side and closed the other and visa versa and shot water up each way but water still comes up in the shower. I also used a wand down the toilet but that did not work either. I am goinr to check what you said and see that will solve the problem. If not I guess I need to get it professionally cleaned or try the flush king. I will write back what happened.
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Old 12-05-2014, 01:07 PM   #13
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You can buy a drain snake at the nearest hardware store for less than twenty dollars. First run it down the shower drain and see of that doesn't pull out a nasty clog, if that doesn't work disconnect your drain hose and try going up the grey water drain if it hits a stop right away your valve is closed and probably needs repaired or replaced. Be careful if it's not the valve you may loosen up a plugged pipe and get a blast of nasty water.
Good luck let us know what you find.
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Old 12-05-2014, 04:41 PM   #14
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Is the sink you are talking about in the bath or kitchen? Does it matter which one you use or does it backup when you use either? If both backup in the shower then it sounds like your grey tank is full if only the bathroom sink then it sounds like it is that drain.

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