--- title: "How Often Should You Replace a Whole-House Water Filter? (2026)" description: "Cartridge filters, tank-style media, and softener resin all have different schedules. Here is the realistic replacement timeline by system type." lang: en json-ld: | [ { "@context": "https://schema.org", "@type": "Organization", "name": "Whole House Water Treatment", "url": "https://wholehousewatertreatment.com", "description": "Independent U.S. reviews of whole-house water filters, softeners and reverse osmosis systems, plus state and city water-quality guides." }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "How often should a whole-house water filter be replaced?", "acceptedAnswer": { "@type": "Answer", "text": "Cartridge systems (the 4.5\" by 20\" multi-stage units from iSpring, Aquasana Rhino, or Pentair) need new cartridges every 6 to 12 months. Sediment cartridges go first, especially on well water. Carbon-block cartridges follow shortly after. Tank-style catalytic carbon (SpringWell CF, SoftPro Carbon) lasts 6 to 10 years on city water before the media is exhausted. There is no annual cartridge cost. You replace the entire media bed at the end of its life. Salt-based softener resin lasts 10 to 15 years on properly pre-filtered water. The thing you actually refill monthly is the salt in the brine tank, not the resin. Salt-free TAC conditioners need a media bed swap every 5 to 6 years. They do not regenerate, so there is nothing to do between replacements. UV lamps are replaced annually regardless of how the water looks. Output drops below the certified disinfection dose long before the lamp visibly burns out. Reverse osmosis units have three or four filters on different schedules: pre-filters every 6 to 12 months, post-carbon every 12 months, and the RO membrane itself every 2 to 4 years." } }, { "@type": "Question", "name": "How often do cartridge filters need to be replaced?", "acceptedAnswer": { "@type": "Answer", "text": "Every 6 to 12 months for most 4.5\" by 20\" multi-stage systems. Sediment cartridges go first, especially on well water, then carbon-block cartridges shortly after." } }, { "@type": "Question", "name": "How long does tank-style carbon media last?", "acceptedAnswer": { "@type": "Answer", "text": "6 to 10 years on city water before the full media bed is exhausted. There is no annual cartridge cost in between, just periodic backwash cycles." } }, { "@type": "Question", "name": "Do I need to replace softener resin every year?", "acceptedAnswer": { "@type": "Answer", "text": "No. Properly pre-filtered softener resin lasts 10 to 15 years. The thing you refill monthly is the salt in the brine tank, not the resin itself." } }, { "@type": "Question", "name": "How often should a UV lamp be replaced?", "acceptedAnswer": { "@type": "Answer", "text": "Annually, regardless of how the water looks. UV output drops below the certified disinfection dose long before the lamp visibly burns out." } } ] }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://wholehousewatertreatment.com/" }, { "@type": "ListItem", "position": 2, "name": "Learn", "item": "https://wholehousewatertreatment.com/learn" }, { "@type": "ListItem", "position": 3, "name": "How Often Should You Replace a Whole-House Water Filter?", "item": "https://wholehousewatertreatment.com/learn/how-often-replace-whole-house-filter" } ] } ] --- [![Whole House Water Treatment logo](/assets/logo-Cd_iTZFZ.png)Whole House Water Treatment WHWT ](/) [Find Your System](/find-your-system)[Best Filters](/best-whole-house-water-filters)[Best Softeners](/best-water-softeners)[Well Water](/best-well-water-filtration-systems)[Water Quality](/water-quality)[Guides](/buying-guides)[Learn](/learn)[About](/about) 1. [Home](/) 2. [Learn](/learn) 3. How Often Should You Replace a Whole-House Water Filter? Learn · 4 min read # How Often Should You Replace a Whole-House Water Filter? ![Three white sediment and carbon filter cartridges on a wooden workbench](/assets/hero-cartridges-DzMjouOL.jpg) Cartridge systems (the 4.5" by 20" multi-stage units from iSpring, Aquasana Rhino, or Pentair) need new cartridges every 6 to 12 months. Sediment cartridges go first, especially on well water. Carbon-block cartridges follow shortly after. Tank-style catalytic carbon (SpringWell CF, SoftPro Carbon) lasts 6 to 10 years on city water before the media is exhausted. There is no annual cartridge cost. You replace the entire media bed at the end of its life. Salt-based softener resin lasts 10 to 15 years on properly pre-filtered water. The thing you actually refill monthly is the salt in the brine tank, not the resin. Salt-free TAC conditioners need a media bed swap every 5 to 6 years. They do not regenerate, so there is nothing to do between replacements. UV lamps are replaced annually regardless of how the water looks. Output drops below the certified disinfection dose long before the lamp visibly burns out. Reverse osmosis units have three or four filters on different schedules: pre-filters every 6 to 12 months, post-carbon every 12 months, and the RO membrane itself every 2 to 4 years. ## Recommended products that solve this If this is your situation, these are the systems we recommend. Buttons open the brand's current pricing in a new tab. Top pick SpringWell ### SpringWell CF1 Whole House Filter Whole-house carbon filter [![SpringWell CF1 whole house catalytic carbon water filter tank](https://www.springwellwater.com/wp-content/uploads/2025/03/CF1.png)](https://www.springwellwater.com/product/water-filters/whole-house-water-filters/) Image: [SpringWell product page →](https://www.springwellwater.com/product/water-filters/whole-house-water-filters/) Tank-style catalytic carbon with a 6 to 10 year media life on city water, no annual cartridge cost to track. [Check latest price on SpringWell](https://www.springwellwater.com/product/water-filters/whole-house-water-filters/)[Read full review →](/reviews/springwell-cf1) Also consider iSpring ### iSpring WGB32B 3-Stage Whole-house cartridge filter Cartridge-style 3-stage example if you prefer the cheaper upfront price and yearly cartridge swaps. [Check latest price on iSpring](https://www.ispringfilter.com/products/wgb32b?ref=example)[Read full review →](/reviews/ispring-wgb32b) ## Frequently asked questions How often do cartridge filters need to be replaced? Every 6 to 12 months for most 4.5" by 20" multi-stage systems. Sediment cartridges go first, especially on well water, then carbon-block cartridges shortly after. How long does tank-style carbon media last? 6 to 10 years on city water before the full media bed is exhausted. There is no annual cartridge cost in between, just periodic backwash cycles. Do I need to replace softener resin every year? No. Properly pre-filtered softener resin lasts 10 to 15 years. The thing you refill monthly is the salt in the brine tank, not the resin itself. How often should a UV lamp be replaced? Annually, regardless of how the water looks. UV output drops below the certified disinfection dose long before the lamp visibly burns out. ## Keep reading - [Sizing a whole house water filter →](/buying-guides/sizing-a-whole-house-water-filter) - [Best whole house water filters →](/best-whole-house-water-filters) - [How to install a whole-house water filter →](/learn/how-to-install-whole-house-filter) ## More explainers - [ Is Chloramine Safe to Drink? 4 min read ](/learn/is-chloramine-safe-to-drink) - [ Do I Need a Water Softener? 4 min read ](/learn/do-i-need-a-water-softener) - [ What Are PFAS in Drinking Water, and Should You Worry? 5 min read ](/learn/what-is-pfas-in-drinking-water) - [ Well Water vs City Water: True Cost Over 10 Years 5 min read ](/learn/well-water-vs-city-water-cost) Whole House Water Treatment Independent, U.S.-focused reviews and water-quality guides for whole-house filters, softeners and reverse osmosis systems. Informational only - not medical or safety advice. 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