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Old 09-08-2015, 02:08 AM   #1
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Rockwoood 2404S- Black Water Flush

Hey guys, back with another question. Every time I RV, more seem to pop up.

So, I bought a hose to flush out my black tank, but it didn't work.

I opened up the black, dumped and closed. Then the gray and dumped. Then i connected my black flush hose on, opened the black, opened the flush hose and.... NOTHING!!!

I'm guessing there's a log clog since no water came out and my black tank started reading 3/4 full - then full. It wasn't until I left the toilet running that some stuff came out of the black again, but I'm guessing it wasn't assisted by the flush hose.

Seems simple enough. Did I do something wrong?
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Old 09-08-2015, 03:15 AM   #2
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Yep, them ginormous floaties can be a PITA!

Are you practicing black tank etiquette? Conservative with the TP, using TP that will readily break down in H2O (some brands will maintain their consistency for days) and ensuring the black tank is near full when it's time to dump.

Dump and flush the black tank before dumping the grey water. That way you're employing the soapy grey tank water to clean out out the stinky slinky. Never use the black tank flush with the gate valve closed or to otherwise fill the black tank. If one them floaties, or a glob of TP, gets in the way of the vent, the outcome can be real messy.

It's not unusual for crud (usually TP) to adhere to the black tank level sensors and give you a false reading. Gotta flush multiple times on occasion to get that crud off the sensors. That may include refilling the black tank with fresh water.

And it's helpful to be able to see what's going on so get one of these:
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Old 09-08-2015, 03:20 AM   #3
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Quote:
Originally Posted by kandl View Post
Yep, them ginormous floaties can be a PITA!

Are you practicing black tank etiquette? Conservative with the TP, using TP that will readily break down in H2O (some brands will maintain their consistency for days) and ensuring the black tank is near full when it's time to dump.

Dump and flush the black tank before dumping the grey water. That way you're employing the soapy grey tank water to clean out out the stinky slinky. Never use the black tank flush with the gate valve closed or to otherwise fill the black tank. If one them floaties, or a glob of TP, gets in the way of the vent, the outcome can be real messy.

It's not unusual for crud (usually TP) to adhere to the black tank level sensors and give you a false reading. Gotta flush multiple times on occasion to get that crud off the sensors. That may include refilling the black tank with fresh water.

And it's helpful to be able to see what's going on so get one of these:

Thank you for your response. All of the above I've done, including the clear elbow fitting.

Black first then gray. I then re-opened the black to "flush" it with the hose. That's when nothing happens.

The toilet paper is the correct RV flushable kind. Not sure what else to do.
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Old 09-08-2015, 04:04 AM   #4
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Quote:
Originally Posted by arutlosjr11 View Post
Black first then gray. I then re-opened the black to "flush" it with the hose. That's when nothing happens.
You should "flush"before dumping the grey. Nevertheless, you may have a check valve issue. The black tank flush system has a check valve to prevent the nasty stuff from backing up into the flush system plumbing. The check valve on your TT is likely to be just inside the connection point for the flush. Some of these check valves have been installed backwards! To determine that, you'll need to remove the sealing ring and the screen at the flush inlet. You should see a ball downstream of the inlet and you should (using a small screwdriver, pen etc) be able to push the ball downstream. If it won't move, your check valve is installed backwards and you'll need to remove the flush inlet and reorient the check valve.
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Old 09-08-2015, 04:06 AM   #5
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Ok. Sounds good. I'll flush before dumping the gray.

Since the TT is only a few months old, I'll let the service guys mess with it.
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Old 09-08-2015, 04:19 AM   #6
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Since the TT is only a few months old, I'll let the service guys mess with it.
Indeed, exercise that warranty!

Suggestion: Utilize the signature block to list your trailer's model no and year of manufacture. Then, when you present a query, forum members will be more apt to jump all over ya with like scenarios or solutions.
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Old 09-08-2015, 11:53 AM   #7
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Is this the first time you used it? If so maybe there is a kink in the hose that goes from flush to tank?


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Old 09-08-2015, 10:42 PM   #8
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Originally Posted by iluvlcy View Post
Is this the first time you used it? If so maybe there is a kink in the hose that goes from flush to tank?


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Yes, it's the first time I use the flush option. I've used the trailer 3 times.
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Old 09-09-2015, 09:44 PM   #9
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Do you hear the water running when you are using the flush? if so it has to go somewhere, if not then you probably have a kinked or blocked flush line.
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Old 09-09-2015, 09:46 PM   #10
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Yes, it's the first time I use the flush option. I've used the trailer 3 times.

I didn't hear anything at all. The black tank gauge did show full tho.
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