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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"Roger Mills" wrote in message
...
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
______
Email address maintained for newsgroup use only, and not regularly
monitored..
Messages sent to it may not be read for several weeks. PLEASE REPLY TO
NEWSGROUP!

Did the tank once have a plastic.. wrapped insulation around it. If so could
be the insulation material. Mine was light brown, fibrous and a bugger to
clean out.

Peter

In an earlier contribution to this discussion,
Peter wrote:


Did the tank once have a plastic.. wrapped insulation around it. If
so could be the insulation material. Mine was light brown, fibrous
and a bugger to clean out.

Peter

No - not in the last 30 years, anyway! It's a circular tank which had an
ill-fitting sheet of asbestos resting on the top. I've replaced this with a
sheet of perspex which fits properly. Quite a few large water droplets
(presumably condensation) collect on the underside of the perspex. I'm
wondering whether I should put some insulation over the top?
--
Cheers,
Roger
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On Sun, 15 Jun 2008 19:48:38 +0100, Roger Mills wrote:

Quite a few large water droplets (presumably condensation)

Yes.

collect on the underside of the perspex. I'm wondering whether I should
put some insulation over the top?

You really need to ensure that this water doesn't reach the edge of the
tank and sneak out due to capillary action and run down the outside making
the supporting timber permenantly damp and thus a nice home for rot or
worm...

As for the brown slime I don't know what it is but it's in my F&E tank and
appeared very quickly. The system is again old and I don't think had any
inhibitor in it until I drained it down changed some of the plumbing and
dosed it. It might be some form of anerobic bacteria or algae (but I think
algae need light).

--
Cheers
Dave.

"Dave Liquorice" wrote

On Sun, 15 Jun 2008 19:48:38 +0100, Roger Mills wrote:

Quite a few large water droplets (presumably condensation)

Yes.

collect on the underside of the perspex. I'm wondering whether I should
put some insulation over the top?

You really need to ensure that this water doesn't reach the edge of the
tank and sneak out due to capillary action and run down the outside making
the supporting timber permenantly damp and thus a nice home for rot or
worm...

As for the brown slime I don't know what it is but it's in my F&E tank and
appeared very quickly. The system is again old and I don't think had any
inhibitor in it until I drained it down changed some of the plumbing and
dosed it. It might be some form of anerobic bacteria or algae (but I think
algae need light).

--
Cheers
Dave.

Talk to Fernox
This is likely to be a fungal type growth which is readily treatable with a
Fernox additive to your header tank.
No I don't work for Fernox, but my FIL and I have both had similar problems.
Describe your findings to the Fernox tech guys (who are pretty good), they
will point you in the right direction

Phil

On Mon, 16 Jun 2008 09:15:31 +0100, TheScullster wrote:

Talk to Fernox

Or google... Useful info on the fermox site:

http://www.fernox.com/?cccpage=bio_contam_CHS&sub=2

Curiously Sentinel don't appear to have a biocide product.

--
Cheers
Dave.

In an earlier contribution to this discussion,
Dave Liquorice wrote:

On Mon, 16 Jun 2008 09:15:31 +0100, TheScullster wrote:

Talk to Fernox

Or google... Useful info on the fermox site:

http://www.fernox.com/?cccpage=bio_contam_CHS&sub=2


That covers it pretty well - thanks.
--
Cheers,
Roger
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