Thanks for the info, when i drained the top tank by connecting a hose to a radiator and running it outside all the water that came out was crystal clear.
We did have the system cleaned out and drained a few years back and a inhibiter put in.
It is getting quieter and the kettling noise seems...
I just emptied the tank Whitespirit66.
I was thinking about draining some of the system to allow the tank to drain away.
Ive had the ballcock tied up and in a week the tank contents have only dropped about a quarter of an inch.
After boxing day ill drain inough out of the system so the tank...
if i tie up the ballcock so the tank and its contents drain away it could take hours if not days.
I suspose it depends on how fast the central heating system uses the water from the tank when the central heating is running.
Best thing i can do is...
I have a baxi bermuda fire and back boiler which is getting very noisy when i put the central heating on.
I get the kettling sound i have heard mentioned on the forum.
Anyway i bought some sentinel x100 and 200 and understood you could put it in the small tank in the loft( not the main clean...