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Old 10-29-2020, 12:49 PM   #1
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Charleston , South Carolina
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Gray Water Backup to Shower Pan

We are having the Gray water backup to the shower pan. It happens when we are driving. Anyone else have this issue? Thanks
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Old 10-29-2020, 01:15 PM   #2
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2016 30' Classic
Rockbridge Baths , Virginia
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What is the grey tank level when you travel? Sounds like it is full.
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Old 10-29-2020, 01:29 PM   #3
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It was about half way full.
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Old 10-29-2020, 01:47 PM   #4
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Quote:
Originally Posted by Charleston40 View Post
It was about half way full.
According to the monitoring system? It's not calibrated/accurate then. If gray water is backing up to the shower then the the tank is full. There can be no other reason. The trap under the drain would keep sloshing water to come up in to the shower. Unless the road was so steep that the level of the water in the tilted tank at the moment was *above* the level of the shower floor. Which is very unlikely.
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Old 10-29-2020, 01:47 PM   #5
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Is there a way to calibrate the gauges?
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Old 10-29-2020, 02:18 PM   #6
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Recommended reading on this topic:

(1) The epic thread titled The Flood from several years ago.

(2) This blog post in which I describe how to install a relief / overflow valve on the gray tank so that excess gray water ends up harmlessly discharging beneath your vehicle, rather than filling your shower pan (and possibly spilling out into your Interstate's interior spaces).
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Old 10-29-2020, 05:26 PM   #7
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Thank you! Great overview and the picture helps too!
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Old 10-30-2020, 10:28 AM   #8
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Victoria , British Columbia
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Because it is the lowest point we use to have grey come up into the shower when the tank is close to full and we move. The simplest solution is to put a lock down plug in the shower drain. We now do this as a habit when we move no mater if the grey is full or empty. No more issue.
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Old 11-01-2020, 06:49 PM   #9
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2013 28' Flying Cloud
Penn Yan , New York
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Backup

We were informed early to put the plug in the shower when moving. Also make sure the water in the toilet is just around the seal when u travel.
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Old 11-01-2020, 07:53 PM   #10
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We were told empty black and gray tank's and full water when you travel. It's worked for us many years.
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Old 11-02-2020, 10:09 AM   #11
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if you boondock you will always have travel times with full black and grey until you can get to a dump.
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