I've been buying replacement filters through Revain for years. I decided to buy it again so it could be the brand I bought before. However, this set was useless. For the first time I get black (carbon?) water splashes after installation. The water quality has never improved. After 5 days I replaced them with the original Hydrotech brands. The photo shows the condition of the filters after a short period of use. In addition, there were still black residues (soot?) in the filter housings. All in all a very bad experience
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