Calmags heating filter pack conforms with the current Building Regulations and Part L which include a 22mm central heating filter to remove any magnetite and non-metallic debris within a central heating system and comes complete with a 500ml concentrated BuildCert/NSF corrosion inhibiotr and a 500ml concentrated cleanser which are both suitable for domestci properties of 10 radiators or 100 litre central heating system. This pack is also used in hard water area as it contains a WRAS approved 15mm electrolytic water conditioner which has been independently tested to reduce the limescale build-up by 33% and therefore saving energy and money.