Bests & Worsts Reviews from Amazon

We've read lots of reviews but couldn't find a definitive review, so we decided to test our unfiltered tap water (in Southern California) and with our new Big Berkey Filtered water and here are the results: Our unfiltered tap water was generally acceptable by the lab with the following notable exceptions: 1. Arsenic: 2.5 parts per billion (ppb) - lab considered this reason for "caution" 2. Uranium 238: 3.1 ppb - also "caution" 3. Aluminum: 94 ppb - caution 4. Fluoride: 0.8 parts per million (ppm) - EPA has not established levels for this category Here are our results with the Big Berkey (using 2 black filters and 2 fluoride/arsenic filters): 1. Arsenic: less than 1 ppb - lab considers "acceptable" 2. Uranium 238: less than 1 ppb - acceptable 3. Aluminum: 19 ppb - acceptable 4. Fluoride: 0.4 ppm (I wonder if we used 4 fluoride filters instead of 2 if the fluoride would be removed completely) Items of note, the lab that tested the water is a professional lab (not a home kit) and there are three levels of interpretation: acceptable (safe), caution (consider filtering) and unacceptable (contact municipality and consider alternative sources). The lab uses ICP-MS method to test the water. Hope this helps. Disclaimer: I have no relationship to the company....I just wanted to know whether or not the filters work!