How Often Should You Replace Your Water Filter?
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Why Filter Replacement Matters
A water filter that's past its lifespan doesn't just stop working — it can actually release trapped contaminants back into your water. Staying on top of filter replacements is one of the most important things you can do to maintain clean, safe drinking water at home.
General Replacement Guidelines by Filter Type
Pitcher Filters
Most pitcher filters should be replaced every 2 months or after filtering approximately 40 gallons of water. If you use your pitcher heavily, check the manufacturer's recommendation and replace sooner if the flow rate slows down.
Faucet-Mounted Filters
Faucet filters typically last 2–3 months or around 100 gallons. Many models have an indicator light that signals when it's time to replace the cartridge.
Under-Sink Filters
Under-sink carbon filters generally last 6–12 months depending on your water quality and usage. Higher sediment or contaminant levels will shorten the lifespan.
Reverse Osmosis Membranes
The RO membrane itself typically lasts 2–3 years, but the pre- and post-carbon filters in an RO system should be replaced every 6–12 months. Neglecting the pre-filters puts extra strain on the membrane and shortens its life.
Whole-House Filters
Sediment pre-filters in whole-house systems may need replacement every 3–6 months, while carbon filters can last 6–12 months. Always check your system's manual for specific guidance.
Signs Your Filter Needs Replacing Sooner
- Water flow has slowed noticeably
- Taste or odor has returned
- Water appears cloudy or discolored
- The filter indicator light is on
Set a Reminder — Don't Guess
The easiest way to stay on schedule is to set a recurring calendar reminder when you install a new filter. Write the installation date on the filter housing with a marker so you always know when it went in.
Zero Filter replacement cartridges are designed for easy swap-out and are available for all our systems. Stock up and never miss a replacement.