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Hi my name is ***** ***** I have been in the plumbing field for 20 years. I will be glad to help you today. Sometimes city metered water is from a community well. Do you know if that is the type water you have? Do you know what type of water pipe was installed? CPVC maybe?
Do you have the same result only running cold water or is it mostly when the hot water is on?
I see. The water pipes cannot be regular PVC....or at least cannot be for the hot water piping. Technically it is ok on the cold water lines. The water pipes must be CPVC I must assume. When installing this type of piping it is often glued incorrectly. When it is being glued together the installer is only supposed to put glue on the pipe and not inside the fitting when putting it together. This most often is not how it happens. The installer puts glue on the pipe and inside the fitting then glues it together. The glue squeezes out inside and when they turn the water on for the first time the glue flakes off inside the water pipe. The glue is yellow or orange. The glue gets stuck in various places and as it dissolves causes this issue. Most other fixtures have a screen in them so you will not see it there as much or at all. If you remove one of your shower heads or aerators on the end of a sink faucet you will find plenty of yellow or orange flakes in the screen. I would have the installer flush your system out and get all of the glue flakes out of the system and water heater.
I am not sure how long the glue would take to dissolve or even if it would ever completely dissolve. The black particles are likely the glue that is cooking in the water heater. There is likely a fair amount in the water heater too. The installer would remove any aerators and shower heads and clean them out and run the water until the water lines are thoroughly flushed out and empty the water heater and fill it a bit then empty again. When the water is run into an empty water heater it stirs up the sediment in the bottom then while the sediment is stirred up the water heater is emptied again. This may have to be done many times to get all of the sediment out of the water heater. The installer will be resistant if you inform them that they installed the water piping incorrectly but it is true. When they came out with that type of pipe about 15 years ago we had a rep come out and describe how to glue it. Almost all of the installers were resistant to not putting glue in the fitting. I may be the only one who glues that type of piping correctly.
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