Here’s the cheat sheet: change your filter cartridges every 6-12 months, and expect the full system to last 10-15 years. Write the date on the filter with a marker—yes, actually do it. Your future self will high-five you.
And if you’re like Sarah and your water looks like tea? Don’t panic. Just run the faucet for a minute, change the filter immediately, and swear aloud that you’ll never procrastinate again. We all know that’s a lie—but at least now you know what your filter is whispering when you ignore it.