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Old 05-02-2012, 10:12 PM   #1
Steve Jackson
 
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Black Tank Flush

My black tank has the interior jets that flush the tank. My question is how long should I run the water to get a good flush.
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Old 05-02-2012, 10:14 PM   #2
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I run mine until the water running out is clear. I put a clear plastic extension on the drain so I can watch what is coming out. See other threads about how to prep for draining the tank. some use a soap solution or soap and bleach, and drive a bit before draining.
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Old 05-02-2012, 10:16 PM   #3
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First thing is get a clear discharge elbow and open the valve and run the flush until the water is clear. Will take from 5 to 15 minutes depending on how long it has been since it was flushed before. Try to dump the black tank when it is at least 2/3 full.
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Old 05-02-2012, 11:00 PM   #4
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A clear 45 or 90 degree elbow is the way to go so you have a "window" to see what is going on. Mine has the bayonet connection on each side and goes between the outlet and the hose. Flush till the water is clear and you are good to go.
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Old 05-02-2012, 11:30 PM   #5
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When flushing the black tank, is it better to close the dump valve and let the tank fill for a few minutes or leave the dump valve open during the flushing process?
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Old 05-02-2012, 11:36 PM   #6
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I like to fill it up a bit with the flush going, dump it and repeat a couple times.
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Old 05-02-2012, 11:39 PM   #7
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Quote:
Originally Posted by Weekendcamper View Post
When flushing the black tank, is it better to close the dump valve and let the tank fill for a few minutes or leave the dump valve open during the flushing process?
My camper has a warning sticker under the turboflush hose inlet that prohibits running the flusher with the dump valve closed.

I am sure the reason has to to with over-pressuring a full tank.

Having said that, once I dump completely, I turn on the turboflusher; run it till it is clear; then while the flusher is still running, I close the valve for about 30 seconds and re-open it. I do that three of four times, just to make sure. I then close the valve before I shut off the water to the turboflush. That puts a few gallons of clean water in the black tank.

Then I go inside and add a full capful of Calgon water softener and a capful of laundry soap to the black tank through the toilet.
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Old 05-03-2012, 12:05 AM   #8
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Thanks!
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Old 05-03-2012, 06:33 AM   #9
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Mine has the same warning. I too think its because of pressure build up in the tank.
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Old 05-03-2012, 07:06 AM   #10
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Mine has the same warning. I too think its because of pressure build up in the tank.
The tanks are vented,no pressure. Over fill will exit on the roof or open water closet valve. Youroo!!
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