"Used Sentinel x800 to clean the system first. The knocking and clanging got much worse than before, so drained the system and flushed it twice. Added the F2 and turned the heating on for a couple hours that night. Didn't get woken up in the morning from the boiler, actually can't hear it at all !! woohoo....."
4 of 4 people found this review helpful.
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Review 2 for Fernox Central Heating Boiler Noise Silencer F2 500ml