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I am a complete plumbing noob and dont know any terms or names of things yet, but am of reasonable IQ...i think ;) ok tech specs boiler; Halstead best70 (placed high on kitchen wall) Tank; medium sized copper thing with a big red jacket lol ( 1st floor landing) expan tank; small water...

Hi all. Ok the short story is we have terrible limescale here and it keeps wrecking the water system. the cold tank in the attic (some fibreglass jobbie) keeps overflowing. Last time i fixed it by removing the ball and its pushrod and cleaning all the scale. Now it seems the main part of...