This filtration system was recommended by a naturopathic doctor based on its ability to remove most of the toxins that we all are taking in with tap and bottled water. I do not have any testing equipment, but know that others have tested this product and it received top marks. My experience with it is that it is easy to install/set-up, very well constructed and the water tastes a million times better than Southern California tap water. I have had a few questions along the way, and Igor has cheerfully and skillfully answered them all. I would recommend this to anyone looking t improve their health through better water.