About a 2 weeks ago I flushed my CH system (less than 6year old) with
sentinel x400 Desludger.
The method was as follows:
1) Turned off supply to CH header tank
2) Drained the system from drain point. Lots of brown stuff came out.
3) Added x400 to filling headrer tank.
4) Removed air from all rads starting upstiars
5) Ran System full blast for 6 hours (As recommened by guy at plumb
6) Turned off supply to header tank
7) Drained system from drain point and all other downstairs rads (all
downstiars rads have drain points). More brown stuff.
8) Filled up CH systems and removed air.
9) Turn off supply to header tank. Drained again, more brown stuff.
10) Refilled system and removed air.
I have some X100(inhibitor) but for some reason didn't add it.
Now a couple of weeks later rads showing signs of sludge again, this
can't be good (is theis because I never added the x100 :(.
Question is what should I do now?
Should I drain the system again?
Should I drain the system and take the rads off?? If I did this then
are there any tips (like replacing seals in rads etc)?
Sorry about length of post. Any help would be most appreciated.
I'm just getting into the swing of things with my radiators, from help on
here. On Christmas Eve, I decided to flush mine. But I drained my system
down and then took each radiator off and into the garden. Unfortunately my
radiators only have one entry pipe, so flushing with a hose wasn't
practical, but just half filled them and kept shaking them and flushing
A lot of s***t came out of these things. Unfortunately I couldn't clear my
huge double radiator, but it did help. I then filled and flushed then
filled again with sludge remover. The following day when I drained down
again (yes Christmas day) I then watched the quality of the water coming
out. For the first ten seconds it was brown, and from then on the till the
last drop it was virtually crystal clear. Having now refilled with
inhibitor, my system shared the same tank as the hot water, so hasn't had
inhibitor in it since 1975 (label of install on the old tank) the radiators
are now wonderfully hot - better performance than before. Refitting mine I
didn't need any seals of any type, just crank the nut tight.
A previous post suggested by Andy H that all radiators should come off and
cleaned then a sludge remover used. I certainly know what he's talking
I thoroughly recommend the 'remove and flush radiators' method - worked
wonders for me (though did have a brown lawn for a while!).
From what I remember reading on my old bottle of X400 was that it can be
used for a number of days or even weeks. I might suggest possibly removing
all rads and flushing outside with a hosepipe until they run clean (even
after shaking). Then run X400 for a few days/week. After that, flush whole
system with clean water. Once happy, add inhibitor.
Hope that helps.
On 3 Jan 2004 13:10:41 -0800, insane firstname.lastname@example.org (Satpal
It'll be quicker and cheaper.
Do watch out for sludgy water when you open the radiator valve unions.
The iron compounds in the sludge are a very effective dye.
When you take the radiators outside turn them upside down and put a
plastic bag secured with a rubber band on each valve tail. This way,
you won't get any drips.
At each radiator position, with other radiators turned off (note the
position of the lockshield valves) flush some water out. This will
removed sludge that has collected in the pipes as well if there is
Once you have the major amount of the sludge removed in this way, put
in some more flushing agent and run hot for a few days. Then drain,
flush and refill, adding inhibitor.
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