advice for getting additive into system

[Coaster]

hello all,
i've a dialema, getting fernox 200 into the c.s. system. problem is, i've already got setinel 100 in and so can't drain off!! any ideas how I can do this?
any help much appreciated.

ive looked into sucking water out the bleed valve of a radiator, then inject additive in but the hole is too small

 

[twgas]

fernox (or sentinel) 200 ?
What problem do you have that needs more additive?

 

[Coaster]

hiya twgas,
typo.. lol sorry I ment sentinel 100 is already in which i put in 2 years ago.
the system's an oldish indirect.
the heat exchanger is slightly kettling and was told sentinel 200 would help, but not sure if I can get it in without loosing the 100

 

[HERTS P&D]

For god's sake man, drain it down and re fill with x100 and x200.

Andy

 

[Galoka]

Yeah, I would just drain it down a bit, chuck the X200 in the F&E tank, probably with another bottle of X100 (extra inhibitor is no problem, and for £15 not worth bothering about), and refill.

But if you don't want to you could use one of their Rapidose cans

http://www.sentinel-solutions.net/product/listing/central-heating/rapid-dose/

 

[Coaster]

oh wel.. i suppose it's another ten mile bicycle ride to screwfix then. ta for the advice.

 

[Coaster]

forgot to ask...
one of the radiator's valves leek out the shaft when the valve is closed. are the glands easy to replace or s a new valve needed?

 

[twgas]

Some are easy, but a new valve is more likely a better option as you're draining anyway.

 

[Coaster]

one last thing.. is the rapid-dose type sentinel additive container able to fit any type of radiator bleed screw hole?

 

[Galoka]

Dunno, never used it. I'd check on the Sentinel website

 

[twgas]

If you're draining to fit rad valve, use the normal bottle and tip it in the f&e tank