On Mon, 7 Nov 2005 08:42:43 -0000, "TheScullster"
wrote:

Hi all

Anyone have experience of both product ranges?

I've used both and had similarly good results.


Despite using fernox cleaner a year or so back - left running for a week in
the system IIRC, I recently had to clear a blockage of powdery magnetite
from a central heating 15mm plastic radiator feed.

This would suggest that either you have a problem with introduction of
air, or that the system was somewhat clogged before and material moved
around.


Does anyone have good experience of FerroQuest by Sentinel (or any other
similar product) which is likely to dissolve and remove this sort of
residue? The blockage removed was more like finely ground coal than a
powdery sludge usually flushed through rads!
8 rads have been removed and been thoroughly blasted through or replaced, 6
have not been disturbed.

I think that you may have described your problem. Chemical cleaners
can only do so much in terms of loosening or removing crud.

If you just cleaned half the system mechanically, then it's quite
likely that there is a fair amount of material left and some moved
around.

Some while ago I wrote up some notes on what I did to do a thorough
system clean.

In short it involved:

- Taking off radiators one at a time and flushing them outside. (Care
because the sludge stains)

- Using the header tank or filling loop, flush at each radiator valve
while radiator is removed.

- Refit and refill using a system cleaner. Run hot as appropriate.

- Thoroughly flush again and refill adding inhibitor.

This avoids crud being circulated around the system. It has to leave
by the shortest exit. Obviously it works better on a sealed system
because you can flush with mains pressure.





Phil


--

..andy