Does Fernox Cleaner F3 need to be flushed out of the system?

Fernox Cleaner  F3 should ideally circulate around the system for at least one hour, or up to a week, after which it should be drained out and the system flushed/ cleaned before adding Fernox Protector F1 or Filter Fluid + Protector together with a Fernox TF1 Filter to protect the system from further corrosion and scale formation.