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Thanks for the comment - I'm not too sure if it is gas or air to be honest - the problem has only recently shown up (last month or 2) - I assumed that it wouldn't be inherent in the system and I thought gassing would be a long term problem? I have cleansed the system and refilled with...

I am getting a regular air lock in my bathroom radiator - the highest radiator in my bungalow - almost certainly due to leak in system - however I can't find it so it must be minor I was intending to use a leak sealant additive Fernox or similar - I am however concerned that this may cause...