Maintenance
When Should You Replace a Whole-House Water Filter Cartridge?
When to replace a whole-house filter cartridge depends on rated life, capacity, and your water. Learn how to tell, and what to avoid.
The calendar date is only one part of the answer. Cartridge filters are usually rated for a specific service life, capacity, or operating condition, and replacement timing can vary with sediment levels, water quality, and household demand. The product manual and performance data are the controlling references.
Look for the manufacturer’s stated time interval and gallon rating, plus any system indicator. Keep a record of the installation and replacement date. Reduced flow can mean a cartridge is loaded with particles, but pressure problems can also come from plumbing, a closed valve, or another stage. A taste or odor change may justify checking the system, but should not be treated as a lab test.
Use only compatible replacement elements. A cartridge that physically fits may not have the same certified claim, capacity, or flow rating as the original. Follow directions for shutting off water, depressurizing, replacing seals, flushing the new element, and checking for leaks. EPA advises reading and following the specific manufacturer’s installation and maintenance instructions. EPA guide (opens in a new tab)
If the filter is being used for a health-related contaminant, replacement is especially important: the product’s reduction claim applies under stated operating conditions and capacity. Check the exact model’s data sheet and certification. Do not wait for water to look, taste, or smell different.
