Fernox Central Heating Protector F1 500ml Option:500ml flat spray and fine rose Lockable flat spray and fine rose Lockable variable flow trigger and separate flow control It's heat resistant so will help protect against everyday scuffs and scratches environmentally friendly Protects against corrosion and scale in mixed metal central heating systems When used in conjunction with Cleaner F3 gas savings of up to 15% can be achieved every time you heat your room Stops frequent venting of radiators Prevents sticking pumps and boiler noise Reduces maintenance costs and saves on fuel bills Prevents cold spots in radiators Non toxic