This is my fourth cartridge change and so far they have worked perfectly. This last cartridge is an exception. When I unwrapped the cartridge, I saw a dark substance on it that I assumed was charcoal. I washed the top to remove material and installed the filter. I flushed the system for about 15 minutes before using water. The water had a specific taste that wasn't present with previous filters. After two weeks, the taste of the water is still unsatisfactory. Today I will change the filter. I hope the new one works fine.
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