Complaint / review text:
Started noticing black granules in top of pitcher. After changing the filter the new one started doing the same thing.
Contacted Zerowater and they said this had been a problem with some filters, and sent me replacements. Thought all was good until recent batch I purchased started doing the same thing. I don't know if it is harmful, but not what I want to see in the top of my water pitcher. Have discarded the whole thing and bought a Brita.
Maybe it doesn't purify the water as well, but it doesn't look disgusting and make me feel uncomfortable about what I'm drinking.