Originally Posted by alias

Science [& some potheads on the internet] say no, it does not filter tar. Here's why:

Tar=Benzopyrene
http://en.wikipedia.org/wiki/Benzopyrene

Benzopyrene has a solubility in water of 0.00000038 g/100 mL (taken from http://www.iephb.nw.ru/~spirov/hazar...)_pyrene.html), or 0.0038 mg/L. It's practically insoluble. http://forum.grasscity.com/recreatio...fficiency.html

The water DOES get dirty because it filters out PARTICULATE matter.