Coolant top up?

[Rebiam]

Hi all - when cold my coolant level shows half full on the expansion tank. I would like to top it up and I can see it is green. Should I get some green to top up or should I use water (tap or deoinised??)? I have read quite a bit about which coolant to use, not to mix different sorts etc. When I get time I will drain, flush and bleed as per the fact sheet and excellent you tube video, but in the meantime which is the best course of action?

Cheers all

[Northern Bongolow]

if in doubt just use ordinary water or filtered if you are in a hard water area.