The Brita Pitcher Filter is not intended to purify water. Do not use with water that is microbiologically unsafe or of unknown quality without adequate disinfection before or after the system. Individuals requiring water of special microbiological purity should follow the advice of their doctor or local health officials regarding the use and consumption of their tap water and Brita water. The contaminants or other substances removed or reduced by this water treatment device are not necessarily in all users' water. See user's guide for detailed instructions.