I had the Nova system installed last year and can say it is the best addition I made to the home. Water taste great, no scale in the shower, less detergent used and the filters last a long time w/o replacing them. The unit has a pressure gauge where the water enters the filters and there is another gauge after the filters. This way you do not have to guess as to when to change the filters. Once the pressure drops by 10 or more pounds at the second gauge, it's time to replace them. We haven't had to change them yet but will get them from Bob when the time comes!
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