I have inline meters on my RO filter. I will occassionally pin point check the holding tank to see how the tds creep is going. Once my Carbon blocks are over a few months old then I will do a Chlorine/chloramine test on my holding tank when I fill it. I think it's called a free ammonia test but...
The Pro has UV spectrum and additional light channels and controls. Not a huge premium for additional benefits. If I were going to spend That kind of money ,then I would spend a lil extra and get all the benefits. Otherwise you might as well look for less expensive options. I got lucky and won a...