First, know your gadget. Pitcher filters (like Brita or PUR) are the gateway drug to filtered water. They’re the indie band of the filter world—accessible, but with a limited shelf life.
Most manufacturers say to swap the cartridge every 40 gallons, or roughly every two months. If you’re a solo sipper, that might stretch to three. If you’re a family of four, you might be swapping it while binge-watching reality TV.
Faucet-mounted filters are a bit more robust. They typically last 100 gallons (about three to four months). Think of them as the reliable sidekick—always there, but eventually losing their superpowers.
Under-Sink and Countertop Titans
Under-sink systems are the heavy lifters. They use larger cartridges that can handle 500 to 2,000 gallons. That’s roughly six months to a year of steady use. They’re the SUV of your kitchen—roomy, powerful, but not something you forget to check.
Countertop models, like the Berkey or gravity-based filters, are the hipster of the bunch. They can last a year or more if you scrub their parts and treat them kindly. But don’t test their patience with muddy tap water.
Refrigerator filters (the ones in your smart fridge) are the divas. They last about six months, but your fridge will nag you with a little light when it’s time. Ignore it at your own peril—or enjoy the taste of yesterday’s salad.
