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Old 12-02-2015, 02:59 AM   #15
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Thank you, thank you, thank you

I will look at the various options, but until then will do some manual transfer from gray to black.

Thanks again,
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Old 12-02-2015, 11:46 AM   #16
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My gray water backed-up into the shower stall almost over flowing it. Had to run outside and open up the gray water valve which emptied the shower stall and the gray water tank. Has anyone experienced this before on a 2013 '25FC FB?
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Old 12-02-2015, 12:34 PM   #17
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We recently saw a new LeisureWay B-class built in a Sorinter platform that had many innovative double use functions including dumping grey to black if you want to. In their case, the grey is above the black. Not clear on AS TT's, though!
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Old 12-02-2015, 12:36 PM   #18
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Originally Posted by High Cloud View Post
My gray water backed-up into the shower stall almost over flowing it. Had to run outside and open up the gray water valve which emptied the shower stall and the gray water tank. Has anyone experienced this before on a 2013 '25FC FB?
Yes, this is quite common and why we carefully monitor the level of our tanks all day long!
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Old 12-02-2015, 12:55 PM   #19
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The need to redirect gray water into the black tank— at least when boondocking— stems from a design deficiency. Airstream got it right (for once) on their Interstate Class B motorhomes, where the gray tank is the same size as the fresh tank, 26 gallons each. With fresh and gray tanks the same size, even if you don't use the toilet and therefore don't use the black tank, by the time the fresh tank is empty you still haven't overfilled the gray tank.

Even though I don't generally boondock, I make use of this feature when I'm camping for an extended period at a Corps of Engineers campground or State Park with a dump station rather than sewer hookups. Instead of hooking up to municipal water, I fill the fresh tank, then use it until it's empty. When the fresh tank is empty, it's time to go hit the dump station. I don't worry whether my tank gauges are accurate, because the fresh water pump sucking air is all the indication I need that the gray tank is getting close to full. In four years of ownership I've never overfilled the gray tank.

But on most Airstreams, the fresh tank is larger than the gray tank, and that is the design deficiency I mentioned— and that's what causes the need for a way to transfer gray water to the black tank.

Perhaps the most elegant way to do it, if you're willing to make the effort, is to install a second pump, that draws water from the gray tank and routes it to the toilet, so you are always flushing the toilet with gray water. A duplicate of your fresh water pump would serve admirably for the purpose, but the gray tank would have to be modified with the same type of fitting that connects your fresh tank to your existing pump.
On our 2009 International 28, all three tanks are the same size.

When boondocking, a larger fresh tank would actually be nice, so I guess if you have that set up I wouldn't exactly call it a design error :-) When we boondock, we create a larger fresh tank by filling up about 12 gallons of fresh in portable tanks as we do the pre-camp fill up as close to camp as possible. We bring these in in our Sprinter TV, and then park them next to the fill for fresh and top off the fresh over the first few days. (These tanks are collapsible, and stored in the skinny, difficult to use back corner of the rear bedroom lower wardrobe.)

We monitor our gray and black tanks and can pretty well predict when we'll need to dump. Because the dump station is only 8 miles away, we long ago decided to be a little less conservative in our water use (we're windsurfing in salt water, so nice to shower after sailing). When we boondock in a fresh water sailing area, we can go ten + days, but when we're sailing salt water, we'll fill the grey in about 5-6 days.

We've never done the bucket thing with the pre-heated shower water--nice idea, everybody! But when we do the math, even two trips to the dump station in two weeks is just not that much of an inconvenience from our point of view.

Of course, if the dump station were 50-100 miles away, that would be a very different story!
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Old 12-02-2015, 02:05 PM   #20
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On our 2009 International 28, all three tanks are the same size.
Which kind of means your black tank is too large; under normal circumstances you'll never come close to filling it even when your gray tank is brim full.

I'll admit, 26 gallons isn't a whole lot of fresh water, but for just me it does all right, and it's about the most you'll find on a B-van. By sponge-bathing in a bathroom sinkful of water (easy when you're bald as an egg) I can routinely stretch 26 gallons to about 9 days/8 nights of camping.
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Old 12-02-2015, 02:09 PM   #21
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The black water tank on my '73 was on top of the floor under the bed but I moved it under the floor and added a grey water tank next to it. If my grey water was backed up into the shower I would put the cap that doesn't have the garden hose connection onto the drain pipe sealing the drain system. Then I would open the grey dump valve, then open the black dump valve and wait 30 seconds or maybe as long as 1 minute for the grey water to run into the black tank. Then close the black valve, then the grey valve and both tanks would have the same amount of water in them. Have a bucket ready to catch the 2 quarts of grey water trapped in the outlet when you remove the cap! This only works if both tanks are at the same mounting height. Where is your black water tank mounted? Leland
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Old 12-02-2015, 04:39 PM   #22
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Buy one of these, Valterra T58 Twist-On Waste Valve, Twist-on Valve - Valterra T58 - Sewer Fittings & Adapters - Camping World . Install it on your sewer dump fitting and close it. When the grey tanks fills, go outside and first open the gray dump valve, then open the black dump valve. The grey will flow into the black tank and I doubt the grey tank becomes very contaminated. After the transfer be sure to close both the grey and black valves. When I do this the water level is then equal in both tanks. The second time you transfer grey to black the efficiency is not as good as the first. After 3 times you better go to the dump.
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Old 12-02-2015, 11:41 PM   #23
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Quote:
Originally Posted by High Cloud View Post
My gray water backed-up into the shower stall almost over flowing it. Had to run outside and open up the gray water valve which emptied the shower stall and the gray water tank. Has anyone experienced this before on a 2013 '25FC FB?

That is what happens if your gray tank is full and you continue to run water with the gray tank dump valve closed. There is nowhere for the water to go. The water will begin to exit the system at the lowest open point which will be the shower or tub.


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