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Old 06-12-2016, 05:42 PM   #1
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When the gray tank is full?

So if the gray tank is overfilled what happens? Will it just back up into the tub to let you know or is there a real problem if it's accidentally overfilled?

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Old 06-12-2016, 05:46 PM   #2
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The lowest drain will back up. Usually the shower drain. Time to drain the grey.
It has happened to me several times and no harm done except the verbal assault from my wife who is usually standing in the water!

When I don't have sewer hookups, I hook the drain to the blue boy when I get set up and then it's just a matter of pulling the valve and draining some of it off. Another handy item is a Valterra external twist on valve. If you have 2 grey tanks, you can close the twist on and open the other 2 valves and the grey water will equalize in the two tanks.
https://www.amazon.com/Valterra-T58-...=1&*entries*=0
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Old 06-12-2016, 06:25 PM   #3
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You'd better hope that the factory tightly sealed your shower drain and didn't just fit the pieces together. When gravity draining from the shower pan/tub to the GW tank, it may work flawlessly. When the GW is full and water is backing up and going the other way, it may be leaking water at the drain and pipe connections beneath the shower pan.
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Old 06-12-2016, 06:35 PM   #4
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Quote:
Originally Posted by dewey02 View Post
You'd better hope that the factory tightly sealed your shower drain and didn't just fit the pieces together. When gravity draining from the shower pan/tub to the GW tank, it may work flawlessly. When the GW is full and water is backing up and going the other way, it may be leaking water at the drain and pipe connections beneath the shower pan.

+1

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Old 06-12-2016, 07:26 PM   #5
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Agree, it's a good idea in a rv to check every plumbing drain fitting and assure yourself it is hand tight. I can look under my drain from the pass thru storage and there are no leaks. It has backed up several times.
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Old 06-12-2016, 11:05 PM   #6
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I have heard that you can leave the cap on and open both gray valves and the tanks will equalize. Have not tried it but is sounds like it would work. Anyone done this?
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Old 06-12-2016, 11:29 PM   #7
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Edd505 - That would work - but then what do you you do when it's time to dump? Even if you close the valves, when you take that cap off you're going to dump about a gallon of dirty water on the ground.

Even if it's just shower soap (except for biodegradable soap) it isn't particularly good for the environment. If there are food particles from the kitchen sink then you'll be attracting bugs and wild animals by dumping it on the ground.

I suppose, if the campground dump station has a large enough cement pad that slopes properly to the drain that you could pull the cap and then hose off the excess - but 90% of the campground dump stations I've used are poorly designed with little or no cement skirt around the dump.
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Old 06-13-2016, 05:57 AM   #8
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If you put this on the outlet valve you will have complete control when equalizing.
https://www.amazon.com/Valterra-T58-...=1&*entries*=0
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Old 06-13-2016, 12:22 PM   #9
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I have a cap like this on mine. One of the camp sites I go fairly regular to wants the gray water on the trees between sites. Water in NM is scarce with little rain.
Close the valves before dumping and gallon or so of gray water at a regular dump site. I don't thing would be an issue, just flush it with the hose. I have seen more than that in black tanks with people don't know how the system works. There was a post yesterday from on a guy did just that. Black tank was open when he took the cap off. Last year I went to a dump site leaving and the guy before me just dumped the tanks on the cement pad no hose, what a mess. I got a ranger and took him back before I dumped and told him it wasn't me.
Norty1 I like your idea I need to put one of those in my fittings box.
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Old 06-13-2016, 12:38 PM   #10
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I have seen the results of the black tank valve being opened before the main drain hose is fully attached, and it ain't pretty. That was almost 40 years ago. Poor guy was a mess, and his wife was hysterical. Not with laughter. Sure, it's funny now.

Here in the California desert, BLM generally doesn't mind at all if grey water is emptied on a dirt road somewhere in their jurisdiction. We asked them. They just want it dispersed. So, they recommend cracking the valve open and driving down the road until it's empty enough. Certainly they would have a problem with black water. And you don't really want to empty all the grey water by itself. You want to keep some in the tank to flush your drain hose after the black water has washed through.
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