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Old 07-21-2016, 11:26 AM   #1
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Black tank flush questions?

Got to use my black tank flush for the first time the other day and the first time I ran water through it, I could hear it swirling around inside the tank. I hooked it back up a second without a pressure reducer and could not hear it spraying the second time.

Question 1
Should I always hear water spraying inside the black tank when it's mostly empty?

Question 2
Should I use a pressure reducer on the black tank flush as well?

I hope I didn't mess up my tank flush by using too much water pressure.

Thanks for your help

Bob
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Old 07-21-2016, 05:17 PM   #2
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Well I don't think you can do much damage without a pressure regulator on.These newer rvs have the same type plumbing that your house has.I haven't seen too many camp grounds that have real high pressure. I don't run a regulator at all.
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Old 07-21-2016, 05:27 PM   #3
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I use a pressure regulator for my drinking water but not my blank tank rinse. I want the extra pressure to help rinse away all the goodies in there.


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Old 07-21-2016, 06:43 PM   #4
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That was my thought as well. Do you always hear yours when it's spraying? I could the first time but not the second and I worried I used too much pressure in the flush system.
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Old 07-21-2016, 06:50 PM   #5
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Quote:
Originally Posted by rocketman1083 View Post
That was my thought as well. Do you always hear yours when it's spraying? I could the first time but not the second and I worried I used too much pressure in the flush system.

No I don't hear it but my hearing is poor so I can't judge.

Usually it's the cheap plumbing fixtures in an RV that are likely to fail due to excessive water pressure so unless your camper is hooked up to a pressure washer, I think you'll be fine.


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Old 07-21-2016, 06:51 PM   #6
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Black tank flush questions?

..
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Old 07-21-2016, 07:09 PM   #7
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Thank you for the quick replies. I really appreciate it.
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Old 07-22-2016, 01:51 PM   #8
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I don't use a regulator on the black tank flush since it's always open on the other end. I do hear mine when its empty but don't when its full.
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Old 07-22-2016, 04:32 PM   #9
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I use a pressure regulator on the whole rv if the park pressure is questionable.....65 or 70 # is as much as I'll push the envelope on that one. I've never used a pressure regulator on the flusher since that part of the system isn't under pressure because it's blowing on through to the flusher sprayer in the tank. When it gets filled to a certain point you'll stop hearing the sprayer,,,,,,DON'T GET SIDETRACKED. If it overflows, you might very well notice brown pookie coming down off the roof. This would not be a good time to open your toilet valve. Try it if you're REALLY curious. But you'll be SORRY!!!
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Old 07-22-2016, 07:32 PM   #10
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My wife and I use a "team" approach most of the time when we are flushing and draining our holding tanks. We start by draining the black water tank, with the tank water flushing feature hooked up and running full blast. We do not attach a pressure regulator to the flusher. We make sure that the flusher is working properly by going into the trailer and opening the toilet drain slightly to make sure we hear the flushing water spraying inside the tank. This procedure is how we found out that there was a problem with a previous trailer when the back-flow/check valve on the flushing circuit had failed. No flushing water was getting into the black water tank. Our dealer fixed the problem at no cost less than a month after our 2-year warranty expired!!

To confirm that flushing water is reaching the spraying fixture in your black water tank, I would recommend this kind of team effort.
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