I've been using the same Aquacrest filters since I moved into the house (year and a half ago) and decided it was finally time to replace them. Not that there's any noticeable change in water quality or flow rate, but it's a lot more than the recommended time and who knows how long the previous homeowner had it. I have upgraded to this premium filter to provide additional filtering. Not only are they really easy to swap out and fit perfectly, but to my surprise they let more water through. I really think it's time to replace the old ones!
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