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When I flush my toilet I get a noise from the pipes for a few seconds ?

When I flush my toilet I hear a groaning noise from the pipes. Nothing has changed in the system. Any Advice/
N Wood, November 2008
sounds like "mains hammer" adjust the incoming stop tap and by doing this you also prove that your stop tap will turn off if required(turn it off and on a few times)

chris(ex heating engineer 30 years), November 2008