I'm flushing my 4 year old CH system and wondered about the best way to
ensure a complete flush of the chemicals and grot before refilling with
fresh water and inhibitor.

Should I drain from one point while feeding fresh water in from another,
distant, drain point using my garden hose?

Due to the construction of my house, all downstairs rads are fed from
the room above and are equipped with drain points.

Or to be really thorough, should I flush from each ground floor rad in turn?

TIA

Richard