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Old 06-23-2015, 08:36 PM   #1
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Black Tank Flush

Just a quick question. When using the black tank flush, do you need to be using a water psi regulator just as for the regular water hook up? Thanks in advance!
We are on our maiden voyage with our new white hawk and loving it.
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Old 06-23-2015, 08:50 PM   #2
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I' ve never used a pressure regulator.. The pipe in my trailer for black tank flush is labeled for 100psi, however because the water is exiting and washing the black tank, the pipes arent actually getting fully pressurized.. Curious to see what others have to say...
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Old 06-24-2015, 07:44 AM   #3
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I never use a pressure regulator. Like Skaling says, the nozzle is open in the tank so pipes don't see the full pressure.
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Old 06-24-2015, 08:25 AM   #4
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Makes sense, not seeing full pressure.
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Old 06-24-2015, 09:04 AM   #5
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I don't use a regulator on my flush line either, just on the FW city connection. I want as much oomph as I can get in that flush line.
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Old 06-24-2015, 11:04 AM   #6
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Same here. No regulator on the flush system.
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Old 06-24-2015, 01:42 PM   #7
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Old 06-24-2015, 02:50 PM   #8
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Either way. The water supply I use comes thru the regulator but if it was not, it is no biggie as long as its running.
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Old 06-24-2015, 04:51 PM   #9
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Quote:
Originally Posted by Camper_bob View Post
I don't use a regulator on my flush line either, just on the FW city connection. I want as much oomph as I can get in that flush line.
That ^
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Old 06-24-2015, 07:07 PM   #10
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I use as pressure regulator for "city water" hook up but not for black tank flush.
The CGs I use are kind enough to have a hose to hook to the black tank flush.
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Old 06-24-2015, 07:30 PM   #11
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Many campgrounds have a hose with the end cut off. Get yourself a short section of hose and put a proper threaded end on it for flushing the tank. You'll be glad you did.
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Old 06-28-2015, 06:46 PM   #12
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Thanks for all the responses.
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Old 06-29-2015, 12:46 PM   #13
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Our "Royal" flush consists of - 5 gallons of water poured quickly down the toilet, with the black tank value open.
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Old 08-05-2015, 10:06 AM   #14
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Quote:
Originally Posted by Revschuette View Post
Just a quick question. When using the black tank flush, do you need to be using a water psi regulator ...
I do use a water pressure regulator on the black tank flush.
Primary reason is better safe then sorry.
On our unit the black tank flush hose is located in the underbelly so it's not easily accessible and looks to be the same stuff they use for the water system.
There's no decals indicating different water pressure limits on the black flush, so I'm guessing it has the same limitations as the rest of the water system.

On our previous trailer I blew the relief valve on the black flush due to too high water pressure at the campground and the valve was located inside a wall, what a mess.

That's just what I do, for whatever it's worth.
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Old 08-05-2015, 11:39 AM   #15
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Quote:
Originally Posted by muelldawg View Post
Our "Royal" flush consists of - 5 gallons of water poured quickly down the toilet, with the black tank value open.
that's cute! "royal" because your using the "throne."
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Old 08-06-2015, 10:18 AM   #16
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Here are the directions for using the black water flush from the manual. Notice in step #4 is specifies a minimum amount of pressure, but no maximum. In the fresh water section, it actually has a big warning that says you should always use a pressure regulator on the city water connection. No such warning exists for the black water flush.

SECTION 8-PLUMBING SYSTEMS
1. Connect the flexible sewer hose to the 4 inch
dump outlet.
2. Open the black water dump valve and leave it open.
Allow the tank to drain.
3. Attach a water hose to the Tank Flush Inlet. Do not
use your fresh water hose for this.
4. Attach the other end of the water hose to a
pressurized water source. (40 PSI minimum)
5. Turn ON the water source flushing the tank until
water appears to run clear in the sewer hose.
6. Turn water source OFF. Disconnect water hose from the source.
7. Disconnect water hose from the Tank Flush Inlet.
8. Close the black water dump valve.
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Old 08-06-2015, 05:46 PM   #17
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Quote:
Originally Posted by Quahog View Post
Many campgrounds have a hose with the end cut off. Get yourself a short section of hose and put a proper threaded end on it for flushing the tank. You'll be glad you did.
Found this out on a trip in July - meaning no flush for the black tank that time. I plan on getting another hose to keep along just for that purpose.
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