The Ultraclarity is Bosch's latest filter, manufactured by 3M/Cuno group, which will also fit some Siemens and Neff Models.    If your fridge is in the KA62, KAD62 or K59 range and uses an internally fitting cartridge which mounts horizontally in a compartment at the top of the fridge, then this is the replacment model you need. 

Note if your fridge is a KAN58 or KA58 series it will use the CS-52 replacement also in the Bosch section.

This cartridge is NSF approved and certified to remove Chlorine and improve taste and odour.   It will also reduce particulates including cysts.

Cartridge life: 6 months or 2800 litres, whichever comes first.