When to Replace Your Water Filters: A Complete Guide

Water filters do not last forever. Over time, the filter media becomes saturated with the contaminants it has captured, and it can no longer effectively clean your water. Knowing when to replace your filters is essential to maintaining water quality.

Sediment pre-filters should be replaced every 3-6 months. These filters catch dirt, rust, and sand before water reaches your main treatment system. A clogged sediment filter reduces water pressure and forces your system to work harder.

Carbon filters typically need replacement every 6-12 months. Activated carbon removes chlorine, volatile organic compounds, and improves taste and odor. When a carbon filter is exhausted, you may notice your water starting to taste or smell like chlorine again.

Reverse osmosis membranes last the longest, typically 2-3 years. The RO membrane is the heart of your drinking water system, removing dissolved contaminants at the molecular level. A failing membrane will show up as increased TDS readings in your filtered water.

Post-filters or polishing filters are usually replaced every 12 months. These final-stage filters provide a last polish to your water, removing any remaining taste or odor.

How do you know when it is time? Beyond following the recommended schedule, watch for these signs: decreased water flow or pressure, return of taste or odor issues, visible discoloration of the filter, and increased TDS readings on a meter.

One important note: never try to extend filter life beyond the manufacturer recommendation to save money. A worn-out filter is worse than no filter at all, because it can become a breeding ground for bacteria and actually release captured contaminants back into your water.

True H2O offers filter replacement services and maintenance plans that keep your system on schedule without you having to track replacement dates yourself.