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Old 05-26-2014, 06:53 AM   #15
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We were also experiencing similar gray tank drainage issues last winter. Our tank acted as if there was a "dam" across it and no water would flow out the drain unless it was over the level of the dam. As a result the tank never really drained and we managed OK simply because we usually had full hookups.

This spring we had it power cleaned in Kerrville TX by a company franchised by All Pro Water Flow It was pretty amazing what they got out of the tank! Ping pong ball-sized pieces of calcified "stuff" came out; lime-based deposits like one finds in a boiler system. It took an hour to "scrape" this crud off the walls of the gray tank. The black tank was clean by comparison. After it was all done, water flows easily out of the tank and the gauge reads normally. It was definitely worth the $200 I paid for the service.
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Old 05-26-2014, 07:04 AM   #16
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I bought a Camco Dual Flush Pro Holding Tank Rinser. Hook up a hose to backwash the tanks when dumping and it's clear so I can see what's coming out. I also carry a small snake which thankfully I've never had to use. It's long enough to reach both tanks from the inside drains or from the dump valves.
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Old 05-26-2014, 09:08 AM   #17
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HELP!!! Grey water drain clog

Quote:
Originally Posted by tazsport View Post
Did you ever figure out what was actually stopping the gray water from draining ? I know the backwash worked for you, but what caused the stoppage ? I'm the original owner of my 2006 Itasca Sunrise and have never had a problem with my gray water draining, until today when I attempted to drain my tanks. Black water drained just fine, however the gray water is draining very slowly as if there is a blockage.
Tazsport
Your issue sounds exactly the same as ours (see post 10). I recommend taking a 1/4" drive socket and removing the gray tank blade valve. The obstruction is likely a disk that has lodged right at the valve. Reinstall blade valve. You will be done in 30 minutes or less.
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Old 05-26-2014, 09:54 AM   #18
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BD Howie,

I think we are on the same page. I've never had an issue with the gray water dumping until last night when we experienced the slow trickle. The gray water level gauge shows a couple of lights and we just returned from a 3-day trip so I know the gauge is good.

I opened the blade valve and ran a snake up a least a foot or so. I'm thinking I might have one of those rogue cutout disk lodged some in the drain pipe assembly. I was not able to push through any further with the snake. I've seen other post talking about backflushing to either breakthrough the clog or dislodge the blockage (ie, cutout disk.

Last resort is to disassemble the drain pipe assembly and take a look at what the culprit is. Access to the area is very restricted so I'm hoping it doesn't get to this.
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Old 05-26-2014, 08:34 PM   #19
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There should be a screw clamp at the bottom of the attachment to the tank. Loosen it and remove the bolts that hold the valve together. You can then work the pipe loose to check the opening in the grey water tank. Mine stopped up and it was the cut outs where they cut out the tank to install the drain pipe in the grey water tank. After removing the cut outs no more problems
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Old 05-27-2014, 08:11 AM   #20
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Seldom if ever do owners clean the gray water tank which in time will have problems.
Happy Campers makes a cleaner called Extreme holding tank cleaner that does a
nice job and easy to use.

www.happycampersworld.com


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