Protector F1 500ml Product Code: 56599 Fernox Protect F1 is a central heating system inhibitor that prevents corrosion and limescale buildup. It is suitable for use in all types of central heating systems, including those with non-ferrous metals. It comes in a convenient 500ml bottle that can be added directly to your central heating system without the need for complicated installations or special equipment. Fernox Protect F1 is a cost-effective solution that can help to extend the life of your central heating system, improve energy efficiency, and reduce the risk of costly breakdowns and repairs. It is non-toxic and environmentally friendly, making it safe to use around children and pets. Fernox Protect F1 is compatible with all types of heating system water, including hard and soft water.