On Thu, 14 Sep 2006 16:57:47 +0100, "Christian McArdle"
wrote:

Personally, I would:

Drain
Refill with fresh water
Run entire system for 10 minutes
Drain
Refill with water and Sentinel X400
Run system for a week, ensuring that all parts get used
Drain
Refill with water and Sentinel X100.

This will clean out most systems that aren't already showing any major signs
of malfunction.

Great - thanks.

Drake