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  • Plummers soup is more new build (debris on first use). Is it just limescale on a filter ? - I'm scrapping this idea as typing

  • I wondered that but no, it was an airlock on both hot and cold. I took the mixer off the wall, gently opened the stop valves to check water was getting through and after a couple of gurgles, both cleared, spraying most of the bathroom.

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