dirty water when bleading rads

[gold1875]

i have recently moved into a house that has been empty for 6/8 months. when i blead the rads only a small amount of air came out, but the water was black ! i continued for ages but it was still the same. shouldnt it run clear after a while ? any help greatfull.

 

[HandyJon]

No. The water is black because it contains inhibitor to stop the rusting. The fact that only a small amount of air came out also means that the CH system is in pretty good nick after so long.

See here for such a product - //www.diynot.com/shop/CENTRAL_HEATING_INHIBITOR_1_LITRE/6213

 

[ChrisR]

The water is black because it contains inhibitor

Er, no, sir.
The water is black because it didn't contain ENOUGH inhibitor to stop the rusting!
Inhibitor imparts a yellowish hue. Rust is black.

I would not use Purimachos inhibitor as indicated above. It isn't recommended by any boiler manufacturer as suitable for corrosion protection.

 

[Nige F]

The water is black because it contains inhibitor

Er, no, sir.
The water is black because it didn't contain ENOUGH inhibitor to stop the rusting!
Inhibitor imparts a yellowish hue. Rust is black.

I would not use Purimachos inhibitor as indicated above. It isn't recommended by any boiler manufacturer as suitable for corrosion protection.

You need a powerflus.NOT a Brit,Gas one unless you want to throw££££.get some quotes.AFAK.you don`t have to be CORGI to do a powerflush I thought Purimachos was an Indian Princess