I have had a problem with a bumping central heating boiler for some time.
Sludge removers and descailers in vast quantities and lengthy flushing
sessions with a hosepipe connected to the water main have failed to stop it.
Today I drained enough water off to empty the F&E tank with all the rad
bleed valves closed, which probably caused water to flow through the boiler
in the reverse direction. It was clear at first and then turned a very dense
light brown colour. Going up to the now near empty F&E tank, in the bottom
it had a thick slimy light brown sludge mixed with white flakes, which I
cleaned out. On refilling and firing up the boiler again the bumping was
dramatically reduced but began to increase a little after a few hours.
I think this must be a biological growth of some kind getting into the
boiler. Can any of you kind people tell me something more certain about this
and how to clear it from the system? It has been flushed and refilled with
X100 added several times over the last three years, the boiler is three
years old (Glow Worm Ultimate). The F&E tank has been lacking a lid.
Thanks for any help,
Sounds to me more like hardness scale from the water. Are you in a hardwater
All these descaling agent should not be necessary in such a newish system.
I didn't have to descale my system until it was at least 10years old.
afaik these chemicals are acid so you are probably eating your system away.
My boiler kettling was eventually cured by fitting a pump that was man
enough for the job..
A biological gunge can form in the F&E tank and grow very happily in the
warm condiditons there. No doubt it will die in the boiler but its sludgy
remains, I am told, can cause significan problems!!
several years ago. Dad said it was an old way to get rid of it,
stopped it in about 1 minute. i don;t know why/how it should work, and
it didn't seem to have any negative effects by addition.
maybe the boilermen can give a reason why it did it, and also mostr
likely tell you why you shouldn't do it ;)
On Sat, 08 Nov 2003 18:01:10 +0000, David Hemmings
When used for washing up, dishwashing liquid reduces the surface
tension of the water. I would imagine that in the application you
describe it would stop formation of large steam bubbles.
However, there is a downside. It contains a lot of salt, so you
wouldn't want to use much.
One of the chemicals specifically for this purpose, e.g. from Fernox
or Sentinel would probably be a safer option.
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