heating system (plumbers?)

[phil on a fazer]

you need all the rad valve fully open, then open a drain off cock, when the water stops open the air bleed valves upstairs then on the down stairs rads

yeah thats it......it was a really rushed job against the clock and if i was taking my time i would of thought of that (honest!  )

So when i come to refill the system i will just open up the filler loop on the combi boiler...BUT....ive never actually used or dealt with inhibitors before. ive always thought you filled a rad with the stuff (not sure how? or how much?), refill the system and then it will be carried around the whole heating sytem.....is that right??  :o