A general-purpose treatment to protect against corrosion and scale build up in all types of water circulation central heating systems. This unique formulation has been formulated to improve boiler and system efficiency by reducing fuel consumption. The product protects all metals against corrosion – including steel, copper, brass and aluminium. Dose Rate: One litre of Central Heating System Corrosion Inhibitor is sufficient to treat a typical domestic central heating system of up to ten radiators. For larger systems an additional bottle may be required. Overdosing does not present a problem. Not concentrated.