Hi all

Discovered recently that there was something dodgy in my header tank.
This has occurred since a heating upgrade in October last year.
Strange beige coloured scum on the surface and very murky water so you can't
see the bottom of the tank (even with a torch).

Applied some Fernox AF10 having cleaned out the tank as thoroughly as
possible.
As I baled out the tank it was like there very decomposed shreds of
newspaper coming out with the water.

The question is, will the rest of the water in the system be affected this
way, or is this localised to the header tank?
If it recurrs, the advice on the AF10 bottle was to that the system may need
steralising.
Anyone know what's involved in steralising a CH header tank?

Any other experiences of this stuff welcome.

TIA

Phil