Probably very effective in reducing fluoride (about 1/2 times depending on flow rate) but the boy left a strong chemical after it too Taste washing more than stated. I used this cartridge as a first stage, then a carbon block, then a KDF+GAC cartridge (in my 3-body water filter). Will probably throw away the 2nd stage carbon block pretty soon before it's completely used up, move the kdf to the 2nd stage and use a multi-stage ion exchange resin as the final stage. On the other hand, there is a lot of aluminum oxide in this device; he has to do his job for several years.
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