Fernox Antifreeze Protector Alphi-11 is a combined antifreeze and inhibitor product, which provides protection against internal corrosion and limescale formation in domestic central heating systems. Protects against corrosion and limescale build-up in central heating systems to maintain energy efficiency. Combined antifreeze and corrosion inhibitor to extend system life. Prevents pipework freezing. Compatible with all metals and materials commonly used in heating systems; including aluminium. Non-toxic, environmentally friendly formulation, NSF, KIWA and Belgaqua approved. Suitable for heating and chilled water systems