Doulton Ultracarb ceramic carbon cartridge, 0.5 micron rating for treatment of Giardia and cryptosporidium cysts(99.999%) as well as LEAD and most harmful bacteria, E-coli, Cholera, Shigella, Salmonella, Klebsiella, Terrigena and others. Rated for 4,000 litres 9 ¾ Inch (248mm). Now PFOA & PFOS 'forever chemical' Rated. W9223006
The Doulton Ultracarb is a great option if the water quality is unknown as it has a ceramic outer which can be cleaned over and over. Still has a 12 month service life but with the periodic cleaning can extend the life of the cartridge.
Having the bacteria and E.coli rating is also gives coverage for un-chlorinated water supplies.
Click here for performance data sheet
Alternative to the Doulton Ultracarb is the Aragon Cartridge