Filters work very well and  greatly improve the taste of the coffee,We moved to a district with a different water supply source about  a year ago from one with excellent water, we have some kind of chemicals in our drinking water supply at our new home, that when drank alone have a slightly distasteful odor,  Using these filters appears to eliminate that odor and flavor of the  fresh brewed coffee.  The only draw back is they are a bit pricey.