WATER CONTAMINANT INDICATORS

摘要

A filtering device for a gravity-flow liquid treatment system includes a fir st filter component that can be either exposed or adjacent to a substantially transparent region in at least a portion of a filter housing. The first filter component is capable o f providing a visual indication of exposure to at least one contaminant. The contaminants for whi ch the first filter component can indicate exposure include particles, inorganic, and organic contamination. Particle contamination is indicated by a change in color of t he first filter component through particle collection. Inorganic and organic contaminants ar e indicated by reaction with at least one agent capable of undergoing a color-change reacti on in response to at least one contaminant. Water treatment systems and filtration devices tha t include at least one agent capable of undergoing a color-change reaction and thus give a visu al indication of exposure to at least one contaminant for use in both gravity-driven and pressure-driven environments are also described. 29