This is the best water filtration system I have found.  These filters are made to be extremely effective to capture normal chemicals and other particles that exist in tap water.  I use these filters as part of the Symple Stuff, water filtering system, and use the filtered water mainly for making ice tea, drinking water,  and for nightly use in my CPAP machine because our water where I live in the Midwest is very, very hard.   My CPAP machine requires "Distilled Water",  and these filters end up paying for themself as a replacement of distilled water.