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Old 09-25-2017, 11:59 PM   #1
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So, how does the "Black tank Flush' work?

I see 2018 Jayflights with the Elite package feature a "Black tank flush".
What exactly is this and how does it work?
Is it like a rotating wand inside the tank?
Is it a fixed wand?
Does it go into the tank or just in the discharge pipe?
For those that have it, does it work well?
Does it seem to help prevent the usual black tank clog?
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Old 09-26-2017, 01:24 AM   #2
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Exclamation Just rinse away your problems

My 5'r came with the black tank flush. I haven't read the owners manual yet but I do use it every time I go camping. I suspect it's a simple head that sprays into the black tank to clean the sensors and flush debris.
Here's my quick step by step:

* Black tank (toilet) valve CLOSED while in use
* Gray 1 tank (sink/shower) valve OPEN while in use - long showers!
* Gray 2 tank (galley) valve CLOSED while in use
** Black tank valve OPEN to clean
** Connect black tank flush hose (orange). With valve still OPEN, turn water ON to flush. I'll let it run 5-10 minutes, close the valve for 30 SECONDS and then OPEN again. This allows the tank to fill 1/4 the way up before releasing contents again.
** It's very important you leave the Black tank valve OPEN while flushing as it only takes a few minutes to fill if CLOSED. Should it ever overflow - well, you don't want to think about that. Just leave it OPEN for safety.
* Turn water OFF
* OPEN Gray 2 tank to flush pipe/hose.
* Disconnect hose from 5'r and put in back bumper.
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Old 09-26-2017, 04:00 AM   #3
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I have seen one but not installed. It is a described the previous post below.
A spray head at the top of the tank with a check valve to prevent backflow. It is better than nothing is my report, but it will not completely eliminate tank sensor contamination.

The key item to remember in a black tank is to always start with a couple of gallons and always add more water when you flush than solids.
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Old 09-26-2017, 05:21 AM   #4
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Note that the place you're most likely to use the tank flush is at the dump station... where, very often, the water hose has a spray on the end.
The fitting on the side of our Jayfeather is a regular threaded hose connection... I have learned that it's not a good idea to try to stick the spray nozzle into the flush port and pull the trigger...:-)
I'm going to try using a Water Bandit as an adaptor, next time.

Ian, the wet man from Scotlant
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Old 09-26-2017, 05:42 AM   #5
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Quote:
Originally Posted by WeRJuliian View Post
I'm going to try using a Water Bandit as an adaptor, next time.
Ian, the wet man from Scotlant
Another tip when using a water bandit, Hold the hose connection with your hand when the water is turned on.

Norty, wet redneck.
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Old 09-26-2017, 05:55 AM   #6
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Our previous Greyhawk had a Black Tank flush and our current Bungalow has one for each black tank. On the Greyhawk, the nozzle was visible when flushing the toilet. It sent about 6 streams of water in different directions. With a hose connected to the black tank flush, it sounded like water was being sprayed throughout the tank. On our Bungalow, the nozzles aren't visible and it sounds like water is just filling the tank.

I turn the black tank flush on right before I pull the black tank lever. I let the tank empty, then close the lever. I wait 5 to 10 minutes, then open the lever again and let the tank drain again. I do this 2 or 3 times. Usually, the water runs clear after the 3rd dump. If it doesn't, I just keep filling and draining until the water runs clear. I close the lever one last time, wait a minute then turn the black tank flush off, leaving a few gallons of water in the tank.

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Old 09-26-2017, 08:32 AM   #7
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Quote:
Originally Posted by Packerbacker_TX View Post
My 5'r came with the black tank flush. I haven't read the owners manual yet but I do use it every time I go camping. I suspect it's a simple head that sprays into the black tank to clean the sensors and flush debris.
Here's my quick step by step:

* Black tank (toilet) valve CLOSED while in use
* Gray 1 tank (sink/shower) valve OPEN while in use - long showers!
* Gray 2 tank (galley) valve CLOSED while in use
** Black tank valve OPEN to clean
** Connect black tank flush hose (orange). With valve still OPEN, turn water ON to flush. I'll let it run 5-10 minutes, close the valve for 30 SECONDS and then OPEN again. This allows the tank to fill 1/4 the way up before releasing contents again.
** It's very important you leave the Black tank valve OPEN while flushing as it only takes a few minutes to fill if CLOSED. Should it ever overflow - well, you don't want to think about that. Just leave it OPEN for safety.
* Turn water OFF
* OPEN Gray 2 tank to flush pipe/hose.
* Disconnect hose from 5'r and put in back bumper.
Make sure you close any gray water tank that is open BEFORE you open the black water tank. You don't want any chance of black water getting into those tanks. Also if you leave any tank valve open while parked and hooked to a sewer system, you run the risk of polluting the air with sewer gas going out through your venting system.

Been there and smelt that!
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Old 09-26-2017, 08:41 AM   #8
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I use the BT flush every time I dump the tank. After 2 full seasons, my BT gauge still reads perfectly.
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Old 09-26-2017, 09:19 AM   #9
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When I have the dumpstation all to myself, I use it. I try to get in an out within 10 minutes if there is anyone behind me and this adds a bit of time to the process.

I always use it at full hookup sites before leaving, but we only use those once or twice a year. Around here, those tend to be the 'parking lot' camp grounds we avoid for the most part.

I've used it a couple times at home as well, when I have an empty tank that was drained, but not flushed at the camp ground, dumping the 'flush water' into 5 gallon buckets that I dump down my toilet at home. I bleach out the buckets after. Even a 'clean' black tank stinks so I rarely do this. Almost didn't admit that I ever have.

Speaking of bleach, I had to sanitize my fresh water system this year, some funky well water got in the system that smelled like it was growing stuff (sulfur smell). I made sure a bunch of that concentrated bleach water made it into both black and grey holding tanks. Drove the camper around for an hour and then dumped and flushed the black tank again. Squeaky clean. The water that came out was as clear as it gets. Maybe overkill, but the bleach water was already in the system anyway, no reason not to use it for this too. Also, I've used the black tank flush on an empty black tank, just to get some water in there, without draining.
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Old 09-26-2017, 09:32 AM   #10
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A lot of dump stations around here do not even have end on the hose.I think they don't want you wasting water!
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