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Old 06-15-2016, 05:56 AM   #1
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Black Tank Flush Recommendations

Is it best to use the OEM connection or go with something like a Rhino Blaster?

Also, how often should you do the flush?
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Old 06-16-2016, 06:06 AM   #2
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I use the factory flush hookup on every Black Tank dump. I purchased a clear 90 degree hose adapter and flush until the water is nearly clear. It is best to dump the Black Tank when it is nearly full. Keep the Grey Tank closed until after dumping Black Tank and, after closing Black Tank valve, dump the Grey Tank. This flushes out your sewer hose and helps keep it clean.
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Old 06-16-2016, 07:18 AM   #3
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What Airstream 12557 said, except I usually do the full clean out once per month while traveling and then before putting the AS to sleep for the winter.

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Old 06-16-2016, 07:22 AM   #4
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We have always used our Airstream's built-in black tank flush.

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Old 06-16-2016, 07:27 AM   #5
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The factory flush system has worked well for us on our two Airstreams, no need for an after market gizmo.
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Old 06-16-2016, 08:04 AM   #6
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We use the factory flush every time we dump the tanks. Like 12557 above, we have a clear sleeve that we installed on our sewer hose, which is both gross and useful.
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Old 06-16-2016, 12:18 PM   #7
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My 10 year old Bambi did not come with the factory flush. But I use a Flush-King valve to do the back-flush - it has a clear elbow, a valve, and a hose connection. Keep the black tank valve open, close the Flush-King valve, and the hose back-flushes water into the black tank. I use it every time, minimal residue after 10 years.

IF I had the factory flush, I would use it with a clear elbow EVERY TIME. You don't want residue building in the black tank.
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Old 06-16-2016, 12:37 PM   #8
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ditto posts 2, 3, 4, and 5-
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Old 06-16-2016, 01:05 PM   #9
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I'm a newbie, trailer is coming in July, we'll be staying at a permanent spot unless traveling. When we are at our site, I assume the dump hose is always connected to the input sewer connector in the ground and we are still on tanks flushing when needed. Is this true?
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Old 06-16-2016, 01:31 PM   #10
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Quote:
Originally Posted by heitkergm View Post
My 10 year old Bambi did not come with the factory flush. But I use a Flush-King valve to do the back-flush - it has a clear elbow, a valve, and a hose connection. Keep the black tank valve open, close the Flush-King valve, and the hose back-flushes water into the black tank. I use it every time, minimal residue after 10 years.



IF I had the factory flush, I would use it with a clear elbow EVERY TIME. You don't want residue building in the black tank.


Any recommendations on a clear elbow for a Rhino hose that doesn't leak?
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Old 06-16-2016, 02:02 PM   #11
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Black Tank Flush Recommendations

I have the Camco 45 degree clear elbow from Walmart.
It hasn't leaked in 6 years with my new Rhinoflex hose and it never leaked with the old hose.


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Old 06-16-2016, 03:41 PM   #12
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Sewer Solution works really well also.

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Old 06-16-2016, 04:11 PM   #13
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Our factory black tank flush leaked on our 2014 Sport. I thought it was a stupid device, so did not rush to get it repaired. I did eventually get it fixed (stupid cracked vacuum breaker), and now wish I had it repaired on Day One. I always fill the black tank prior to dumping, even if I have to just run in some water with the foot pedal. Dump, black tank flush on for 10-15 minutes, easy. We also have the clear elbow (wife hates it, thinks it is juvenile, maybe because I named it "The Turd Tunnel") and the water is usually flowing clear within the first couple of minutes. Easy.
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Old 06-16-2016, 06:16 PM   #14
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To the OP... I suggest using the built-in flush Airstream provided on your trailer. I've heard the Airstream rep refer to it as a "use it or lose it" feature - indicating the small holes used to spray the inside of the black tank may/will become clogged if not used regularly.

In addition, I can't imagine that any sort of gizmo attached to the dump hose bayonet could possibly work better than something that is already installed inside the tank.

Quote:
Originally Posted by bminten View Post
I'm a newbie, trailer is coming in July, we'll be staying at a permanent spot unless traveling. When we are at our site, I assume the dump hose is always connected to the input sewer connector in the ground and we are still on tanks flushing when needed. Is this true?
Blank tanks are intended to be relatively full (with considerable liquid content) so they can be dumped properly. After the initial dump it's suggested to partially refill the black tank via the flush port and then open the valve and dump again. I've found that two of these extra flushes are required to obtain relatively clean water coming from the tank. Your results may vary. There are plenty of threads on the subject - I think it's safe to say that everyone says don't leave your black tank valve open indefinitely. Collect the sewage in the black tank and dump when needed, followed by a flush or two.
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