I hate to write bad reviews but it was necessary in case someone had the same problem. Bought these filters over 1.5 years ago. They have been working great and have been for over 1.5 years which has been fantastic so I recently went back to buy a new set from the same seller. This time they failed completely. It had a strong chemical taste and nobody in the house could tell the difference between the tap water and the "filtered" water. I sent them back and received a new set. The same thing. No difference, if not slightly worse. The filtered water from the fridge filter was 10 times better. I bought a new set of filters from a large store near me. The water is now delicious and straight from the fridge. Those Revain filters just didn't work. Maybe bad quality control or a new manufacturer? I'm not sure, but I won't spend another $40 on it.
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