I think mines a Aquacera. Its plastic and uses Doulton filters. Its not the container that matters, its which filters. Filters with carbon filter out chemicals and metals and the others dont. i really like mine. It sure beat buying water.
I also have a sawyer point 1. I havent used it yet but will this summer canoeing. They have great reviews but will not filter chemicals or metals. Its a little cheaper, more portable and faster way to filter. Last forever if you dont freeze it or so Ive read.