The new filter is packed with loose carbon fines—tiny, harmless specks that look like black pepper. You don’t want that in your morning coffee. Running water for 10-20 minutes flushes out those little freeloaders.
It also clears out air pockets that get trapped in the system. If you hear your RO system making gurgling sounds like a grumpy stomach, that’s totally normal. Give it a few minutes, and it’ll start singing a happy tune.
Think of it this way: you wouldn’t wear new socks without washing them first, right? (Okay, maybe you would, but don’t tell anyone.) Treat your filter with the same respect. Your taste buds will thank you.
The “But My Manual Said…” Trap
Every filter brand is a little different. Some say “run for 5 minutes,” some say “run for 30.” Always check your specific manual—but in my experience, 15 minutes is the sweet spot between “safe” and “I’m tired of standing here.”
If you’re like me and you lose track of time, set a timer on your phone. Nothing ruins a good flush like a distracted brain that wandered off to think about pizza. Pro tip: Use that 15 minutes to do a little dance or plan your next snack attack.
Pro tip #2: Run the hot water from another faucet at the same time to help the system avoid freezing or backing up. Just don’t mix the hot and cold lines—your RO system prefers a cool, calm personality.
How to Know You’re Done
You’ll know you’re finished when the water runs clear and ice-cold without any bitter taste. Taste test after 10 minutes. If it tastes like a swimming pool, keep going. If it tastes like heaven, you’re golden.
Another sign: the water pressure will stabilize. At first, it might spit and sputter like a confused coffee machine. After 15 minutes, it should flow smoothly, like a song by The Carpenters—melodic, gentle, and totally unfiltered. Wait, no. Fully filtered.
Be patient. Your patience is the secret ingredient to great-tasting H2O. Rush it, and you’ll be drinking gritty water with a side of regret.
