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Old 09-24-2017, 06:32 PM   #1
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Proper dumping of Black Water

After opening of gray valve and moving on to the black is it necessary to run water back thru the system? This is on a 2016 model.
Thanks in advance
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Old 09-24-2017, 06:41 PM   #2
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I do until it all runs clear.
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Old 09-24-2017, 07:08 PM   #3
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I dump black first. Then I open the gray valve for about 5 seconds and close it. I do this several times. The pressure of the gray water pushes some into the black tank and assists in getting a good dump. I then dump the rest of the gray water which helps to clean the hose.

Al
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Old 09-24-2017, 07:13 PM   #4
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I carry a garden hose and when I dump the black, I hook the garden hose up to the black tank flush and run it till it's clear. Then I close the black valve. Then I open the grey valve. I let the black flush continue for a few seconds so there's some liquid in that tank, then I shut it off and put away the garden hose while the grey is dumping.
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Old 09-24-2017, 08:04 PM   #5
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I was in Jackson Center a couple of weeks ago to get some maintenance and repairs done to the AS. One of those repairs was to replace the vacuum breaker on the black tank flush head. I asked both the service tech and the service advisor about the best way to clean out the black tank. Both offered the following advice: 1) The black tank flush head just sprays water into the tank and becomes clogged up over time, reducing its effectiveness; 2) the best way to clean the black tank is to use a wand sprayer with a rotating head (Camco sells these) inserted into the tank through the open toilet, moving it up and down until the water runs clear, do this after every 2-3 dumps and; 3) dump a bag of ice into the black tank just before hitting the road and let it slosh around in the tank for a while, really cleans the inside of the tank. BTW...you should always dump the black tank first when itís nearly full, then follow with the gray tank (it should be nearly full, too, to get the best flush). Hope this helps!
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Old 09-24-2017, 08:37 PM   #6
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The manual states you should use the black tank flushing connection every time you empty the tank. If you don't, the small holes in the sprayer can get plugged and it's very difficult if not impossible to clear them.

Second, I strongly recommend a clear view adapter to monitor what comes out of your black tank. I know it sounds disgusting, but you'll soon discover it's better than watching almost anything on network TV especially celebrity worship shows like Entertainment Tonight and similar crap, no pun intended.

The reason I recommend this will become evident if you close the dump valve after the black tank it empty. Run the flushing connection for a few minutes (I know the instructions say don't, but try it). DO NOT LEAVE WHILE THE FLUSHING CONNECTION IS RUNNING.

Then open the dump valve and you will be surprised how much more material comes out of the tank. Mostly paper but a lot of it.
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Old 09-24-2017, 09:10 PM   #7
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I keep one of the secondary valves on my trailer all the time. (http://www.valterra.com/product/twis...e-valve-boxed/)

After I dump the black tank, I close the twist-on valve, but leave the black tank valve open. I then pull the grey tank valve open for a few seconds. Then I close the grey and open the twist on valve. It does a tremendously good job at flushing the loose solids out of the black - usually toilet paper.

Lastly, I empty out the grey tank which will then also flush my hose.
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Old 09-24-2017, 10:19 PM   #8
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Originally Posted by Al and Missy View Post
I dump black first. Then I open the gray valve for about 5 seconds and close it. I do this several times. The pressure of the gray water pushes some into the black tank and assists in getting a good dump. I then dump the rest of the gray water which helps to clean the hose.

Al
That is exactly how I do it.

My trailer has a black water flush. I have never used it. Wand? It won't work. My toilet has an elbow before the tank.
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Old 09-25-2017, 05:55 AM   #9
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After I have emptied the black tank, I go inside and flush the toilet for a few seconds, to give a freshwater rinse of the tank, then open the grey valve and finish it all up.

Maggie
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Old 09-25-2017, 06:14 AM   #10
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[QUOTE=LBOskiBear;2012876]I keep one of the secondary valves on my trailer all the time. (http://www.valterra.com/product/twis...e-valve-boxed/)

Has anyone seen this twist on valve available for a Thetford fitting? I had the Valterra valve on my Interstate and loved it. I want to find the same thing for my 2005 Classic which has Thetford fittings.
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Old 09-25-2017, 11:14 AM   #11
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We dump black, then every other dump refill at provided spray inlet and dump again. Then empty gray to help clean out hose.

So far, no problems since 2009.
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Old 09-25-2017, 11:48 AM   #12
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Published on Aug 17, 2014 has a video( Youtube) on the ice in the black tank, I think it's not worth it, suprised that The Mother Ship recommends it. Google "Ice in black water tank" or something close to it, you should get the video.
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Old 09-25-2017, 11:53 AM   #13
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(We have a transparent elbow to attach to the AS to view what's coming out) 1. attach a garden hose (not a clean water hose) to the flush attachment in the AS. 2. turn on flush hose as you pull the black tank handle. 3. One of us stays in the bathroom and flushes a FULL tank of toilet water down the hatch. You'll be amazed to see what is still coming out. Keep the flush hose going. Repeat the toilet flush as needed until the transparent hose is running clear. 4. Close the black tank handle and turn off the flush hose. 5. Open the gray tank handle and keep it open until the tank is fully drained, then close the handle. 6. We always add Pure Power Blue fluid thru the toilet to keep the tank from smelling. When in hot area, double the dose.
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Old 09-25-2017, 11:54 AM   #14
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Originally Posted by flamingoroad View Post
2) the best way to clean the black tank is to use a wand sprayer with a rotating head (Camco sells these) inserted into the tank through the open toilet, moving it up and down until the water runs clear, do this after every 2-3 dumps and;
I have one of these gizmos! Works great. Call me a nut, but I fill that black water tank using the wand a couple of times and let it flush out. Figure the more I fill it with fresh water and dump, the cleaner the tank and the hose will get.

I am not a wack-a-doodle germaphobe, but hey, this is a black water tank we are talking about...

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Originally Posted by flamingoroad View Post
3) dump a bag of ice into the black tank just before hitting the road and let it slosh around in the tank for a while, really cleans the inside of the tank.
Love this idea. I also put a good splash of tank conditioner down the puppy before I head out, always figure it splashed around...great idea about the ice..I'll give it a try.

Am new to this forum. Have a 1961 Bambi! Love all the good info!

Ann
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