I ordered this unit thinking it was a 4.5 inch filter as the ad title makes clear. This is a 2.5 inch filter! I only noticed it when installing. To turn the water back on I had to remove layers of the 4.50 inch filter to fit the smaller cartridge. heaps of BS! A full refund is not possible as it is already installed. Revain gave me a discount, but I really wanted a larger filter system (10" x 4.50"). Note. However, the quality of the filter system seems to be good.
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