We recently bought the Z-Ion system with a Catalina
and, for the brief time we've owned it, it seems to work
fine. Their manual indicates silver and copper ions are released during flushing
to keep the membrane and filters disinfected. For what it's worth, before purchasing
it, I solicited the opinion of a medical
doctor who sails
, and he had a very favorable opinion of the process. The system is not inexpensive.