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Old 06-18-2016, 06:43 PM   #11
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Originally Posted by Charles Firth View Post
Interesting, I always flush the black tank but I have the valve open while doing so. Am I doing it wrong ?
You are doing it correctly. My Wildcat has a warning sticker that states the black tank valve must be open when using the black tank flush hose hookup.
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Old 06-18-2016, 07:50 PM   #12
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No you're doing it correctly. Mine also has the warning stickers. But as stated above, it is an easy way to fill the tank from the outside.

I am not advocating doing it with the valve closed. I just don't understand why it can't be done with out building up enough pressure to possibly pop steel bands or bolts as stated by OP. My tiny brain tells me if the water was left on, the tank would eventually fill to the point of over flowing through the roof vent. Thereby creating the unsafe and dangerous condition stated on the warning label. But that is not the case. The water being added is definitely compressing air like an aersol can. The only thing I can think of is the vent pipe has some sort of check valve which prevents the air from escaping, but that doesn't make sense to me either.
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Old 06-19-2016, 12:22 AM   #13
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Edit above: you are not doing it incorrectly is what I meant to say. Sorry for any confusion.
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Old 06-19-2016, 08:42 AM   #14
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Weird, mine has a warning to not turn on the black flush unless the valve is OPEN. I'm sure they have that warning for a good reason!
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Old 06-19-2016, 08:50 AM   #15
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I can use my black tank flusher at the dump station now. I find 30 seconds to 1 minute at the most keeps it clean as a Kitchen!! No need to waste so much water, filling a tank 3 times is enough water for 200 plus people to DRINK and prepare food in a day!
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Old 06-19-2016, 08:55 AM   #16
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I also use the flush with the valve closed to fill the black tank. It does a better job than just the flusher alone. It's really a 2 person job and you can't be distracted while doing it. I stand outside at the valve while my DS stands at the panel constantly checking the levels. As soon as the full light starts flashing I open the valve. I do that twice if I have a full hookup site or if no one's behind me at a pump out station, once if there's a lineup. I also use it to leave some water in the black tank after completing the dumping process.
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Old 06-19-2016, 08:56 AM   #17
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Weird, mine has a warning to not turn on the black flush unless the valve is OPEN. I'm sure they have that warning for a good reason!
For the VERY reason described in this thread, human frailty!
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Old 06-19-2016, 08:56 AM   #18
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I remember reading somewhere on the forum about a mixture to clean your tank when you are home. Does anyone have that?
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Old 06-19-2016, 08:57 AM   #19
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It normally takes me at least filling black water tank at least twice. My tank stays clean, I don't use any chemical treatment in black tank. Anyway it works for me


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Old 06-19-2016, 08:59 AM   #20
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For the VERY reason described in this thread, human frailty!
Exactly! I flush with the valve closed. I pull the handle every 3-4 minutes until the "lumps" stop appearing in my see-through elbow.
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