These genuine cartridges for Lincat FilterFlow Water Boilers (FX series) guarantee premium quality water with every use whilst simultaneously protecting your beverage machine from limscale build up. It is recommended you change the inboard filter every six months or after 5600 litres of water has been dispensed to ensure the best quality water possible. This Lincat water cartridge fits Lincat EB3FX, EB4FX, EB6FX, EB6TFX, EB3FX/PB, EB3FX/TT AND THE NEW M3F, M5F, M7F & M10F. This filter cartridge is not compatible with the older Lincat FilterFlow water boilers.