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 I dose with Boiler Noise Silencer F2, do I also need to use a Fernox Protector?
Yes, Fernox Boiler Noise Silencer F2 is designed for use with any Fernox Protector. It should be left permanently in the system with Protector F1 or Protector + Filter Fluid and replaced or topped up at the same time.
