it's my understanding that there are only 2 companies that make membranes.... Both good ones. So there really can't be to much difference other then filters.... Prefilters, carbon and DI
resin... Most use the same prefilters the major difference is micron size. Carbon vs. coconut carbon? DI
resin is really the only major difference that I can see. Go with a low priced unit and shop around for replacement resin that works well if your unit burns up the DI
I have a airwater ice unit love it but now that I know more I would have got a cheaper unit. My 100GPD makes about 5 gal
in 1 hour... So if you don;t mind waiting get a lower GPD unit. Remember water temp and pressure effects the output of the unit.