Fernox Protector F1 265ml provides long-term protection against corrosion and limescale in central heating systems. Suitable for all boiler types and mixed metal systems, including aluminium, this eco-friendly, compact size treats up to 100L systems or 12 radiators. Easy to dose via a Fernox TF1 Filter, it optimizes system efficiency, prevents common issues like radiator cold spots, and meets BS 7593:2019 standards for system care.