On Thu, 14 Sep 2006 16:59:35 +0100, "TheScullster"
wrote:

If your initial draining of the system reveals any quantity of sludge or
gritty particles you need to:

Add cleaning agent - again Sentinel or Fernox
I did this via towel rail, isolate towel rail and part drain - take out
bleed connection and add chemical via funnel. Replace bleed connection,
open valves and bleed. This makes sure the stuff is in the system, not in
the bottom of the header tank.
Wind the temperature up and circulate at speed around all system.
(All as instructions on tin and checking boiler and system materials are
compatible with chemical used)
Drain, refill and circulate again to clean.
Drain and refill adding inhibitor.

Thanks very much for the detailed instructions. That's very helpful.

Drake