This is the fun, messy part. Turn the feed water valve back on slowly. Then, open your new faucet—but don’t drink from it yet! Let the water run for at least 24 hours to flush out carbon dust from the new filters. Seriously, it looks like dirty tea, and you don’t want that in your morning coffee.
During the flush, check for leaks. Use a paper towel and wipe every connection. If you see a drip, tighten it gently. If you see a geyser, scream for a bucket. (Or scream for your buddy.) Leaks are normal—they’re the system’s way of saying, “I’m alive!”
Step 8: Patience, Young Grasshopper
RO systems are slow. They produce water drop by drop, like a gentle nature documentary. You’ll wait a few hours for the tank to fill completely. Use this time to admire your handiwork, take a nap, or binge-watch one episode of your favorite show. Then fill the tank once, dump that water (it’s still cleaning itself), and let it fill again.
After 24 hours, your water will taste amazing. Do a celebratory taste test: pour a glass, hold it up to the light, and look for clarity. If it’s clear, you’re a winner. If it’s cloudy, give it another flush. (Cloudiness is usually just tiny air bubbles—like soda, but fancy.)