They are better than nothing. Carbon will remove the chlorine and pesticides and SOME heavy metals like lead. Unfortunately, these filters are not effective against bacteria and sometimes even harbor them. However, the chlorine has killed most of the bacteria. Distilled Water Distilled water can be purchased or can be done at home with a home distiller.
Distillation involves the process of vaporizing water by boiling it.
The steam leaves behind most bacteria and other pollutants, it is then condensed and cooled back to a water state. There has been some controversy about distilled water leaching out minerals from the body. I suggest distilled water to my clients who are cleansing, I don't suggest it be used over the long term, however. If You Must Sometimes tap water is your only choice. If so, you can make it a habit to carry pure essential oil of lemon with you.