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Thanks for the reply.To do this I assume I would first drain the the system,clean it,then put in the inhibitor.Could you tell me the best method to insert the inhibitor into a sealed system?

I constantly have to re-pressurise my central heating system.My boiler is a Vokera Excell 80 SP.The system was fitted about 6 years ago and the pipes are grey plastic [non-barrier]to the radiatirs.I have been told that these pipes cause excessive hydrogen gassing hence the loss of pressure.Does...