How Often to Replace Water Filtration Cartridges

Water filtration cartridges don’t last forever. How often you replace them affects everything from water taste and flow rate to how well the system removes contaminants. While many products quote a timetable, your household’s actual water conditions can shorten—or sometimes extend—the recommended life.

As a baseline, many common whole-house, under-sink, and refrigerator-style cartridges are designed for replacement in roughly every 3–6 months. Some filters may be rated for longer intervals, while others—especially those meant to handle heavy sediment or difficult water—may need more frequent changes.