You use a different cartridge - 171 vs. 170 - and a heparin pump. NKC isn't using the pureflow, you'd be using boxes.
Finally, how many here do nocturnal home on the NxStage? If there are existing threads on this that you can point me to, great.
40L = 8 bags.
NKC has everyone on bags.
50 odd-Pureflow can be a PITA, but I like it better than hanging bags.