---Protector F1 is a market leading inhibitor which protects against corrosion and limescale formation in domestic central heating systems. Quick and convenient – doses in 30 seconds via radiator, filling loop or Fernox Tf1 System Filter – no need to drain down the system ---Protects against corrosion and limescale - Non-toxic, environmentally friendly formulation, Maintains system efficiency and extends boiler life Supports boiler manufacturer’s warranty requirements ---Suitable for use with all metals and materials including aluminium. Treats up to 130 litres of system water (16 radiators) and the equivalent of 250m2 of underfloor systems. ---When used in conjunction with Cleaner F3 gas savings of up to 15% can be achieved every time you heat your room.