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Old 07-23-2012, 09:26 PM   #15
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Older rig I always left both grey and black closed. Rig we have now has a combination washer/dryer. Instructions say to always have the grey valve open. Since we are subject to doing a load anytime, so I now leave the grey open. Until the night before I see we need to dump the black. And no laundry that night.
Years ago saw an article on open vs.closed black. Pretty humorous article. The author talked about having to chisel out the "brown mountain" from rigs who people left the black open.
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Old 07-24-2012, 11:32 AM   #16
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As you will likely find most every RV magazine is full of ads for chemicals guaranteed to keep your black and gray tanks odor free... And not one of them work.

I once accidently left the valves open.. That is the ONLY time I've had a "Tank odor" issue, Closed the valves and within 30 minutes the odor issue was history, IT was coming up out of the hole in the ground (Park Septic System) and bsck through the open valve.

Now, I have 3 tanks, the 3rd is a wash water tank (Bathroom sinks/shower only, no kitchen sink) it is hooked up via a 3/4" Gray Garden hose (Gray water - Gray hose, Guess what color the 3/4 inch hose for my macerator is when I use it... Yup, black)

This hose forms a "Natural trap" so that valve I do leave open.

But the main gray tank, which dumps out the same connection as the black (Different valve though) I close.
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Old 07-24-2012, 03:05 PM   #17
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Speaking of the natural trap of a lowered hose having to go uphill to the elbow...

I'll NEVER do that again !! it was 100 lbs of cra.... I had to lift the hose a bit to walk it down the line to the dump multiple times

got one of these that has velcro to support the hose and it works GREAT !
Easy Slider Sewer Hose Support - Gsi Sports Products Inc 2001 - Sewer Accessories - Camping World
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Old 07-24-2012, 06:59 PM   #18
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With a coach with a washer and drier we leave the Gray valve open.
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Old 07-24-2012, 08:09 PM   #19
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In some places there are ordinances against holding water or other objects in your sewer hose. The hose must be placed so that it is self draining. And where we stay in Florida during the winter it is strickly enforced. If you don't have a hose support they will provide one.
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Old 07-24-2012, 08:39 PM   #20
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Looks like you've gotten some good replies. I'll throw in my $.02 worth. We leave both valves closed. Each day we dump a little off of the gray tank to keep the shower draining nicely. Before we leave I completely empty the black tank. With the black valve still open I fill the toilet bowl 3 or 4 times to the rim and hit the flush lever. I'd guess that the bowl holds about 5 gallons when filled to the rim. That 5, or so gallons goes down pretty quick when you hit the flush lever and in the exact path that any solids may not have made it out all the way. After it's drained nicely, the valve is closed and the gray tank valve is opened. The soapy gray flushes the hose nicely of the stinky poo from the black tank. After the gray tank drains I'll turn on some faucets and run fresh water down the pipes. While they're running we got outside and do other breaking camp stuff like folding chairs up, etc.
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Old 07-24-2012, 08:52 PM   #21
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To add a little more. Sometimes we camp around Frenchman Lake in the nearby Plumas National Forest, about 26 miles from home. No hook ups at any of the sites, but a dump station. If we know the following weekend or in a couple of weeks our next camping trip is with full hook ups we don't dump the black at all. We add some chemicals and let them break down the solids. On the next trip to a full hook up site the tank contents have liquified and we dump before we leave. Most trips are just the DW and me for 2 nights most of the time. 45 gallons of black capacity is more than enough for several days, so skipping the dump after one trip doesn't cause an issue and the chemicals help with the odor when the toilet trap door opens during the flush.
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Old 07-24-2012, 09:00 PM   #22
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Quote:
Originally Posted by Tallyrver View Post
I leave the grey tank open and black closed ,close the grey tank valve the night before leaving to get plenty of water for flushing out the hose after dumping the black tank.

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Old 07-25-2012, 06:51 AM   #23
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Wow, lots of good info here..never thought this would bring back much in replies so I am surprised but appreciative of those that did.
I have a much better understanding of what I need to do using full hookups especially the drain line.
Many thanks..
Bruce
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Old 07-25-2012, 07:08 AM   #24
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Quote:
Originally Posted by Wolfpack Fan
Looks like you've gotten some good replies. I'll throw in my $.02 worth. We leave both valves closed. Each day we dump a little off of the gray tank to keep the shower draining nicely. Before we leave I completely empty the black tank. With the black valve still open I fill the toilet bowl 3 or 4 times to the rim and hit the flush lever. I'd guess that the bowl holds about 5 gallons when filled to the rim. That 5, or so gallons goes down pretty quick when you hit the flush lever and in the exact path that any solids may not have made it out all the way. After it's drained nicely, the valve is closed and the gray tank valve is opened. The soapy gray flushes the hose nicely of the stinky poo from the black tank. After the gray tank drains I'll turn on some faucets and run fresh water down the pipes. While they're running we got outside and do other breaking camp stuff like folding chairs up, etc.
And I do as well, and it works. Last year I was winterizing and used a bucket to drain a small amount of residuals, and the black was cleaner than the gray. I learned this habit years ago in an old low end Class C. Now hear is a question; my current rig has a black tank cleaner hook up for a separate hose. Which works better, 10-15 gallons of fresh poured through the top, or the system hose hook up?
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Old 07-25-2012, 08:04 AM   #25
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Quote:
Originally Posted by DGBPokes View Post
Now hear is a question; my current rig has a black tank cleaner hook up for a separate hose. Which works better, 10-15 gallons of fresh poured through the top, or the system hose hook up?
Our rig has the fresh water hose hook up for flushing also. I used that at winterizing time and let it run for quite a while. Honestly not sure which works better, because I don't know what kind of spray pattern it's got down inside the black tank. It sprays steady and continuous but doesn't send a large volume of water like a full bowl emptying out in 2 seconds. I've got a set up where I can hook up a green coily hose to that off of brass Y, I just don't do it when camping. There's one other thing I started doing recently. I jack up the right side a little with the levelers. Since the drains on on the left side I figure it helps a little.
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Old 07-25-2012, 08:26 AM   #26
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I bought a clear adaptor that extends the from the sewer outlet. We also leave the gray open while black is filling . We will close the gray the day before the black needs dumped. I'm finished flushing when I see clear water. For me flushing clear is especially important before storing. We also use hlding tank chemicals.
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Old 07-25-2012, 10:29 AM   #27
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The worst advice I ever got was when we rented from Cruise America some years ago. The manager told me to leave both dump valves open on the hookup. Even worse, we had to return the rig with both valves open and the cap hanging loose to prove the tanks were empty!
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Old 07-25-2012, 10:32 AM   #28
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Quote:
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JMHO, when you leave the grey valve open, all the RV park sewer gas vents through your grey tank , across your roof and into your site.
I usually set up a trap in my slinky to prevent this.
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