I found the post in the Skin biology forums of all places. The guy who wrote the post created a website comparing the top shower filters, here is the address.
The top winners in his reviews was the "Sprite" brand and the "Vitashower". Be sure and check out what he says about testing the filters with cold water, because the chlorine is more stable and not being steamed off from the hot water, the other filters ability to clear chlorine from the water was reduced 10-15%. HTH