Exactly having Marfans disease puts a timeline on your life. With constant dialysis along with hiding in the mountains his chances for living many years were really low.Even as a CIA asset OBL had a limited life span.
The standard alternative is the routine 4-hour treatment which is administered 3 times per week, in a clinic setting, using different, larger equipment. That would be more difficult to do in a smaller, home setting.
Either treatment series would require steady electricity for device power and refrigeration.