The frequency of changing a whole house water filter depends on several factors, including the type of filter, the water quality in your area, and the amount of water your household uses. Generally, it's recommended to change a whole house water filter every 6 to 12 months. Some filters may need to be replaced more frequently, especially if you have hard water or if the filter is heavily clogged with contaminants. You can check the manufacturer’s guidelines for specific recommendations, as some filters come with indicators that show when they need to be replaced. Regularly replacing your filter ensures optimal water quality, better flow, and improved efficiency of your water filtration system. If you notice a decrease in water pressure or strange odors, it may be time to replace the filter sooner.