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The FW07A is the water conditioning cartridge for use with the  IHTO 3 in 1 boiling water H2OTAP. It is important, particularly in hard water areas, to change the cartridge every 6 months as advised to prevent limescale forming and protect the boiler. 

IMPORTANT NOTE this is not a suitable replacement filter for the Norit filter supplied with many of the ITHO Boiling Water H2OTAP's.