I've used PUR water filters for years. The filters don't indicate when they need to be changed, so I change them when they start filtering water slowly. In the

I've used PUR water filters for years. The filters don't indicate when they need to be changed, so I change them when they start filtering water slowly. In the past, when I lived in Los Angeles and Portland, filters would start filtering water slowly after a few months of use. Now I live near Madison, Wisconsin, and I realized recently that my current filter has been in use for more than a year and it filters water just as quickly as the day I started using it. I contacted PUR to see if there might be something wrong with my dispenser, but the rep suggested that my city's water must be very clean. So I learned that some cities have water that is much cleaner than others.