Gas Central Heating . Chemical Flush ?

[anneasquith]

as above. what is actually done, been advised procedure will take approx. 4 hours. TIA

[SirOracle]

The chemical has to be flushed through all radiators which can take a considerable time.

[Buenchico]

Basically, simply stick the chemicals into the system, wait for them to do their work and then flush them out.

From the instructions provided by a manufacturer of the type of cleaning chemicals used:
"Ideally the system should be powerflushed to remove any existing treatment and contaminant. Fernox Cleaner F3 or Cleaner F5 should be added to system water and circulated hot for at least one hour. After which the system must be drained and flushed until the water runs clear. The cleaning time can be extended to up to one week for hardened iron oxides and limescale"

Source:
http://www.fernox.com/problem+solving/how+to+sheets/cleaning+a+central+heating+system

[anneasquith]

thanks, just looked on G, I wonder will I be left with no water during the procedure. ?

[Buenchico]

>>>I wonder will I be left with no water during the procedure

I can't see why you should. What comes out of your taps is entirely separate to what's going around inside your central heating system.

[anneasquith]

good. after all ' the boys' will need a drink whilst working :)

[SirOracle]

Yes anne Whisky is always better with a little water added.

[buildersmate]

Well, you'll have water, but that coming from the hot tap will be cold after any in the hot tank is used up. Or cold anyway if you have a combi.

[anneasquith]

whisky, while working !!!!!!. I don't mind if it's not hot water.