A friend of mine has this in their apartment http://a.co/4GZcGdC but I'm guessing that's the one you're talking about.

That same amazon page has this for testing http://a.co/dVZweID which I've seen come up a lot when doing research, but it'll only tell you if something is in the water, not what.

I usually skim thesweethome.com for things like this, too.

http://thesweethome.com/reviews/best-under-sink-water-filter... http://thesweethome.com/reviews/best-water-filter-pitcher/#h...