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Please could someone advise how to inject corrosion inhibitor into a closed system (combi). I presume it's through the filling loop and can be done without draining down... but what device is best used?

Hello, I have a banging combi (Potterton Lynx 2), it works fine when CH or DHW are operating individually. But if the CH is on, when hot water is drawn it makes a single fairly loud bang. Suggestions as to the cause greatly appreciated! p.s. As I'm writing this, I've just heard it bang again...