biomed tec in acute dialysis

Questions for hospital dialysis units.1) Does your biomed do cultures and disinfect your portable water machines or are nurses responsiable for this task. How often do you do this and what do you do when your portable machines are not being used?
2) how many units of servive do you get per dialysis treatment.
3) how many stations do you have?
Thanks Judy ( troubled and overworked dialysis nurse)