The micron rating of a water filter refers to the particle size that the filter can effectively capture and remove from the water. The rating indicates the level of filtration of the filter and its ability to remove contaminants based on their size. Knowing the micron rating is not only critical to choosing the right water filter for a specific water quality concern, it can also help consumers choose the right water filter. Different pollutants have different particle sizes, and by knowing the micron size of target pollutants, consumers can choose water filters with micron ratings to effectively capture and remove these pollutants.