The contractor brought the plumbers back and they supposedly cleaned every fixture and flushed the lines for an extended period of time.
The Shower has a Moen mixing temperature mixing valve which apparently has filter screens before the cartridge which can not be easily accessed (at least not by me).
Less then two weeks after flushing the system, the mixing valve is not letting any hot water through the shower head again. We get plenty of pressure if I set the mixing valve to cold and almost none to the hot side. I assume this is a indication of the problems being only on the hot water side. I also assume the cause is that the screens are clogged again.
My question is, what is the best way to flush the copper piping? What could possible be causing this much garbage in the lines? Is this common in new construction?
Thanks for any help.