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Not sure whether the mould died of its own accord or if the plumber put his hand in and pushed the mould under. It has vanished quickly. I saw it Sunday and he looked yesterday (Monday) when he came to change a faulty pump. So I need to check it again at a later date.

Update. I have just looked in the tank and the white blobs have gone and left just two dark brown flattish flotations. Presumably the result of died mould. Murky water stops me seeing the tank bottom. I will leave things as they are for now.

I now have an email. I quote the main bits: "The mould is the result of airborne bacteria and not the result of the inhibitor added . . . the bacteria will not have any negative effect on the operation of the system unless you fully drain the system again. . . remove this bacteria . . . by...

Thanks JohnD. Will do.

Thanks JohnD for the reply. The blobs are puffy looking and are very white in colour and resemble mould growth but yes, I can't be certain it is not the solidifying of the chemicals from the x100. I have no experience with the stuff. Previously, with my own repairs keeping a potterton...

18/5/09 Hello All. Central heating modifications a few weeks ago. Now there are lots of white mould blobs floating on the water surface of the new plastic header tank. Not seen any previously. Cleaner chemical added, while system was hot with circulator pump running for a few...