How often should whole house water filters be changed?

The frequency of changing whole home water filters depends on factors like water quality and filter type. Here are some general guidelines:

• Culligan Aqua-Cleer® Advanced Drinking Water System: Replace the carbon and particulate filters once a year, and the reverse osmosis membrane every 3-5 years.
• Culligan AC-30 Good Water Machine®: The particle filter, activated carbon filter, and polishing filter should be replaced annually.
• Culligan Preferred Series: The filter replacement frequency depends on the model. For the Preferred 150 series, replace the filter every 750 gallons or once a year; for the Preferred 250, replace every 1000 gallons or once a year; and for the Preferred 350, replace every 300 gallons or once a year.