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Old 09-29-2020, 12:38 PM   #1
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Clogged cold water lines

Changed out our Dometic 300 to a 320, since I have had to take out the 320 and clean out a clog from the supply valve (twice). I think it may be calcium?

Is there any way to add something into the city water connection to flush out the lines?
Last time I ran a hose from the supply line into the black tank, thought this would have solved the problem but it didnít. Last trip we flushed toilet using jug of water.

Shower runs good; kitchen and vanity are a little slow (both cold & Hot).
Any thoughts or suggestions?
Thanks
Ed
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Old 09-29-2020, 12:40 PM   #2
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Do you often drain your plumbing from the low point drains without putting the water heater into bypass?
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Old 09-29-2020, 12:54 PM   #3
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I have only drained the system in the winter around January. Being in Texas I camp year around.

I have never pulled the bed apart (heater is under the plywood bunk beds) I don't know if there is a water heater bypass.
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Old 09-29-2020, 02:02 PM   #4
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Many of us here on the forum feel the calcium comes from the water heater and often times it is because people open the low point drains without bypassing the water heater which will siphon deposits out of the water heater and into the plumbing where some of that calcium remains and gets distributed back into the system (and the toilet screen) on re-pressurization.

Here is a photo of the dip tube in a Suburban water heater showing how easily it could siphon in deposits with its close proximity to the bottom of the tank...
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Old 09-29-2020, 02:31 PM   #5
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Thanks for the reply.

Iím going to unscrew the deck on the bunk bed to get access the water heater and look to see if there is a bypass, if so Iíll bypass it then hook up to city water and flush the low point drain and the toilet supply by connecting a garden hose to it.

If not Iíll pull the anode rod and flush the water heater as well.
Probably needs a new rod anyway.
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Old 09-29-2020, 03:06 PM   #6
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Every RV with a water heater has bypass valves. RV's are built to be sold anywhere so just because you bought your rv in the south does't mean much. It's the same whether the RV is east coast or west coast built. This is especially true if you buy a used rv.
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Old 09-29-2020, 03:58 PM   #7
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What was meant was I do not winterize or flush the water system, because in the south I camp at least once or twice a month at our property in the country two hours from the city.

Except for January and February, little too cold for DW.

And yeas there is a bypass under the bunk beds, to bad they did not build in a simple access panel. Guess that's another project for me to do.
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Old 09-30-2020, 01:30 PM   #8
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Well depending on what part of Texas your in that would be normal deposits. We have very hard water especially in central and south Texas. My doctor even said it contributed to my kidney stones. But that's a whole different story.
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Old 09-30-2020, 03:50 PM   #9
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Thanks for your reply, Our property is little east to Rockdale, that about an hour or so east of you.

I flush the entire water system. Had the low points open (both Hot & Cold)
Flush out water heater as well, anode was not to bad still had about 60% life left but I replaced it with a new one
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Old 10-01-2020, 04:46 AM   #10
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Quote:
Originally Posted by TCedmon View Post
If not Iíll pull the anode rod and flush the water heater as well.
Probably needs a new rod anyway.
Id do this first. They make a little tool to put on the end of a hose to flushout all those little white balls.

https://www.amazon.com/Camco-Rinser-...23020441&psc=1

Those are created by your anode rod degrading and doing its job
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Old 10-01-2020, 06:52 AM   #11
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Doug
Thanks for your response

Yes I have that little tool and I did flush the heater with it.
A lot of calcium was flushed out; I also install a new anode rod.

Hopefully the toilet valve will not clog on next weekendís trip.
Thanks Again,
Ed
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Old 10-01-2020, 02:17 PM   #12
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Doug
Thanks for your response

Yes I have that little tool and I did flush the heater with it.
A lot of calcium was flushed out; I also install a new anode rod.

Hopefully the toilet valve will not clog on next weekendís trip.
Thanks Again,
Ed
Once you have the WH flushed out there may still be calcium balls in the cold water lines, waiting to cause you grief.

Go to Lowes or Home Depot and get a flex hose with one end 1/2" pipe Male.

On both of your sinks and the toilet, one at a time, disconnect the water line from the cold water side and put the other in a bucket.

Have someone else turn the water on at the outside faucet and let it run into a bucket you are holding. With no restrictions and such small a distance it should not take more than a gallon or so at each one til you have flushed all the fresh water lines.

If you have access to the back of the shower valve do that one too.

do this and you will NOW there are no restrictions on the toilet.
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