Water systems for hemodialysis application can work with any model hemodialysis machine. I have consulted on about a dozen clinic installations/new construction in the last 10 years. Mr Hannis said it well. Listen to him.
I have Gambro and Marcor(US company) water systems and both have proven to be vary reliable. Biomed is responsible for the water systems and hemodialysis machines. Had to learn a lot of plumbing skills. Both offer heat disinfectable systems which work very well and cuts way down on using those nasty disinfection chemicals.
In Canada a water system for hemodialysis application must have a medical device liscence designation. Is this required as well in the UK?