Fernox Cleaner F3 should ideally circulate through the system for at least one hour, or up to a week. Afterward, it should be drained, and the system flushed and cleaned before adding Fernox Protector F1 or Protector + Filter Fluid, together with a Fernox TF1 Filter, to protect the system from further corrosion and scale formation.
When should Protector + Filter Fluid be used in a heating system?
Protector + Filter Fluid should only be used in combination with an in-line system filter, which can trap and contain the debris in the system before safe removal. It is ideal for use in circumstances where a system has previously been cleaned or flushed but subsequently has not been adequately protected so further corrosion has taken place. It is also
