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Does anyone know of a descaler that you can use to clean out secondary heat exchangers that is cossh approved?

Been to a Genus 27 BFFI today no instructions and really struggling with it. Can anyone help?

Does anyone know the ratio for CO to CO2 at which a boiler is deemed to be clean? is it 0.0008 and below?

Found out a fantastic tip last week some of you may all ready know it but for those of you that don't, you will think it is amazing (as did I!) Circulation problems as you all know can be caused by blockages, in particular blocked cold feeds. However, how can you tell where a blockage is or...