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Old 01-03-2019, 04:11 PM   #1
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Black water from kitchen sink

We just purchase the rig and it has been sitting for less than a year. Not sure what is happening, I get black water out of the kitchen sink on the cold side only. Nothing from shower hot or cold, bathroom sink hot or cold, toilet, or kitchen filtered water. It doesn't smell and after the faucet runs for awhile it goes away. It doesn't seem to matter if the water pump is on or outside water hooked up. Slide in or out doesn't make a difference. Added bleach to holding tank and drained and flushed three times, didn't help. Some one said it was the flex lines(cold only) on the slide out and may be deteriorating. If it is the water lines, can I change them. Help is needed
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Old 01-03-2019, 04:43 PM   #2
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If there is a filter on the fresh water maybe the media is compromised and dissolving into the water steam....sounds like you have more issues...anything frozen?
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Old 01-03-2019, 05:27 PM   #3
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It is always a good idea to tell us what year make and model of RV your question is about.

It sounds like you have a cold water taste/odor filter cartridge in line with your kitchen sink faucet, it may also feed an ice maker in the refrigerator if your RV has one.

New filter cartridge has to be flushed to clear the black powder in the filter cartridge out, its a side effect of how the cartridges are made. Once you flush it about 5 times or so you should stop getting the black water each time you start the flow.
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Old 01-04-2019, 06:02 PM   #4
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Old 01-07-2019, 04:10 PM   #5
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It's what powercat says it is I'm sure. I went through this same problem with my freshwater filter under my kitchen sink inside the sink cabinet.
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Old 01-07-2019, 07:30 PM   #6
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I assume you mean "black colored water" and not "black water" from your holding tank, which would be impossible since the faucet isn't in any way connected to either of your holding tanks. I also vote for a cold water filter cartridge that's been installed in addition to the "filtered water" cartridge.
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Old 01-09-2019, 05:13 PM   #7
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As previously mentioned it is the water filter, I had the same issue.
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Old 01-11-2019, 08:45 AM   #8
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Quote:
Originally Posted by Brickwallbob View Post
We just purchase the rig and it has been sitting for less than a year. Not sure what is happening, I get black water out of the kitchen sink on the cold side only. Nothing from shower hot or cold, bathroom sink hot or cold, toilet, or kitchen filtered water. It doesn't smell and after the faucet runs for awhile it goes away. It doesn't seem to matter if the water pump is on or outside water hooked up. Slide in or out doesn't make a difference. Added bleach to holding tank and drained and flushed three times, didn't help. Some one said it was the flex lines(cold only) on the slide out and may be deteriorating. If it is the water lines, can I change them. Help is needed
Without reading all of the other comments, my first thought is to remove all of the filters (if residential refrigerator, that one too) and run fresh water through everything for 15 min at least. Then sanitize the system and put new filters in.
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Old 01-14-2019, 01:55 AM   #9
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Cool

If you winterized and got RV anti-freeze in the hot water tank that will create a black water looking corrosion problem and you will see black streaming water for a while. It will go away soon.

This can also happen when one of your hot water tank "check valves" stick and your hot water tank "back-fills". This happened to me this last summer and I too was concerned about black water coming out of the hot water side of the faucet.

Question: Are you finding the black film only coming out of the hot water side?

In my case, I removed both my hot water tank check-valves and "drilled them out." Then I reinstalled them, because finding replacement pipe fittings on the road was a problem. The interesting thing is that you don't need the spring loaded check-valves that fail often. You just have to be sure your winterization procedure allow you to "By-pass" the hot water tank.

Then again, RV anti-freeze in not that harmful to your aluminum hot water tank and it does dissolve the hard water deposits inside.

So be sure to clean out your hot water tank properly too! Sounds like it's overdue.
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Old 01-14-2019, 09:23 AM   #10
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Black water

I'm only getting the black water from the cold side, only from the kitchen faucet. After about 3 - 5 minutes of running cold water the black color will go away. Nothing from bathroom sink, shower, toilet, or drinking water filtered water. One of the ideas was to check for a fresh water filter under the kitchen sink, work in progress there. Also some said it could be the slide out flex water lines deteriorating. Thanks for your help.
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Old 01-15-2019, 02:32 AM   #11
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CLARIFICATION/CORRECTION: I think when I got black water out of my faucet it was actually the shower valve that I noticed it most. And I can't remember if was coming out of the cold or the hot side since the shower has a mixing valve.

And now that I think of it, when I checked the plumbing schematic, I think the shower with was first faucet after the hot water tank... and the shower might let more water volume out vs. the bathroom sink. I also remember some from the kitchen faucet, but I can't remember if it was from the cold or hot side.

What I can say conclusively, in my case, my hot water check valves (either one of them or both of them... I can't say for sure) were stuck closed or partially stuck closed. I drilled them both out for extra measure...but...

I presume it was the lower check valve (cold water inlet side) since that makes sense to me; and I think the water pressure was "back feeding" into the hot water tank from the top.

In my case, the hot water tank worked fine; AND THE HOT WATER TANK WAS VERY HOT. (Release your tank pressure relieve valve and confirm or capture some of that water in a cup and use a digital cooking thermometer.)

...And when I tried to get hot water out of the shower/ faucet it stayed cold 90% of the time with 10 second intervals of hot water coming every 1 minute or so and then cold again.

* Do you have full 145+F hot water in your tank?

* Is your hot and cold water working normally out of the faucet? I think not.

I also think the black is from the Aluminum corroding and the balk is Aluminium Oxide... and not from the PEX hose deteriorating. But that too is a guess on my part. ...PEX is plastic and would not leach a black compound when it oxidizes.

* Sound like you you should clean your hot water tank too. You might watch a video on using white vinegar to do this. You can also use your winterization plan to pump diluted vinegar into the hot water tank... after you change out or drill out your check valves. That's my bet! Good luck and let us all know what you find.

Here a link you might read on my hot water problem from start to finish:
Water heater bypass valve fix??? - iRV2 Forums
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