I have a Northstar reverse osmosis system at home. I replace both of these filters every six months when the orange light starts blinking. There are 2 adults and 3 children living in my house. Our water tastes great. Unscrewing and screwing in the filters is easy. Changing both filters and the battery takes less than a minute. My plumber told me to buy and install these filters myself. It's easy and it works.
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