On 2007-05-06 10:15:23 +0100, Horse With No Name said:

Martin Pentreath wrote:
On 4 May, 14:31, "Ian_m" wrote:

Since been informed Fernox do some additive you can add and leave for a week
that will disolve the sludge so no need to takes rads off.

I think DS40 is the most agressive stuff which Fernox makes, it will
dissolve most things (including radiators if you're not careful).


So you inject the additive, leave for a week then just drain off?
Then presumably you refill with an inhibitor?

Danz

You thoroughly rinse and flush with plain water in between.

Also, do check the actual sludge removal chemical in terms of how long
it is recommended to leave it in the system. Some are OK for a week,
others for hours only.


Don't expect these chemicals to perform miracles. If there is a lot
of sludge, then mechanical removal is the only effective way.