I recently flushed out my CH system [1] and renewed the inhibitor - 4 litres
of Fernox MB1, most of which I poured into a radiator, but also put some in
the F&E tank, as suggested on the bottle.

At the same time I made a new (not airtight, but getting on for) lid for the
F&E tank out of a piece of perspex. This was about 3 week ago.

Yesterday I noticed some funny stuff floating on the surface of the water.
It looks like a cross between mould and frog-spawn. When you remove it, it
compresses like wet tissue or cotton wool.

Anyone got any idea what it might be, and of the likely consequences? I've
removed this batch, using a tea strainer, but it will probably come back.

[1] In case it's relevant, I didn't use any flushing chemicals but I did
take all the rads off and wash them out with a hosepipe, and I flushed the
pipes out by opeing each radiator valve in turn (with the rad off!) until
the water ran clean. I also flushed the main flow and return loop between
boiler and airing cupboard.
--
Cheers,
Roger
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