MAIN THEMES AND SOURCES
1. Activated alumina (AA) and bone char, the 2 most popular filter medias, are not effective when the pH or the water being filtered is above 6.5. Unfortunately, our household water in 99.9% of cases is above 7.0.
2. Filters need a lot of activated alumina and/or bone char to be effective for very long. More than you will find in a typical household water filter.
3. Effective filtration requires a long "soak time" to allow the AA to absorb the fluoride. Much longer than you will want to wait with a flow through filter.
4. AA needs to be flushed and recharged to maintain effectiveness. Impossible with a countertop or undersink application.
5. The only household applications where you can be assured of 95%+ fluoride removal are reverse osmosis and distillation.
6. Many tests shown by fluoride filter companies are either for a very short period of filter usage, were tested using a custom made solution in small quantities, or don't indicate what the pH of the tested solution was. |