There's a comparison on EWG.org that lists compounds Reverse Osmosis removes that carbon filter doesn't: Hexavalent Chromium (Erin Brockovich carcinogen, no le

There's a comparison on EWG.org that lists compounds Reverse Osmosis removes that carbon filter doesn't: Hexavalent Chromium (Erin Brockovich carcinogen, no legal limit, found in my water supply) Nitrates and nitrites (a top carcinogen of processed red meats)