I've been after some of these for eges. Everywhere I go either doesnt sell them or if they do sell them, they dont have any instock. Currys had them for about £4.99 then I tried Amazon!
* Upstream filtration system
* Time for result: 3 seconds
* Cartridge life: 6 weeks
* Claris cartridge change indicator on time and volume of water filtered
* No extra tank needed