One litre of this radiator inhibitor is suitable for a domestic heating system of up to 10 radiators or 70 litres This central heating inhibitor checks corrosion, disintegrates scale and disperses sludge from central heating systems For best reults treat system with cleaner and sludge remover before adding inhibitor Dose via the feed and expansion tank or via a radiator as per BS/7593:2006. Can be used with a power flush machine, Weight: 2.5573622392 pounds, Manufacturer: Primaflow