We change ours yearly, don't really watch how many gallons were used. Our system is now 5 years old and the filters were always still pretty clean until this last change where they were pretty dirty. I guess it depends on where you live and where the water is coming from, a lot of people down here over the years complained about dirt in their water, these were people without filters so there is a lot of dirty water in certain sections, I personally think that was from the way the pipes were put out in the dirt waiting for installation. Also, we noticed a huge change in the taste of the water but we included the softener when we bought our Nova system, they did not try to talk us into the softener, just the opposite, we were told most people get away without it. We use Potassium pellets, the water tastes great, we eliminated the fridge filter, no hard water spots, no calcium buildup around the faucets or anywhere else, and the water is definitely softer, not slimy feeling like it is with the sodium pellets, just a clean soft feeling. We did have one problem with the system at the 5 year mark, something broke, I don't remember what it was but it was repaired quickly and reasonably. I would highly recommend the Nova system.
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