Vitcas®Central Heating System Inhibitor Protects against corrosion and limescale formation to maintain system efficiency. Suitable for mixed metal systems including aluminium. Inhibitor is available as 1 litre of liquid or in concentrated form in 310ml cartridgeCentral Heating Inhibitor Vitcas® Central Heating System Inhibitor is a multi-purpose treatment, specially designed to protect the entire central heating system from scale, sludge and corrosion. Compatible with plastic and glass-fibre header-tanks and with all metals used in central heating systems which includes iron, steel, brass, copper and aluminium. System Inhibitor is also suitable for micro-bore systems constructed from plastic pipes. To ensure ongoing protection, annual treatment with System Inhibitor is recommended. System Inhibitor does not contain mineral oil. System Inhibitor is only suitable for fully indirect systems. Not suitable for use with PRIMATIC single feed cylinders. If the boiler suffers from knocking and