First, turn off the water supply to your system and depressurize it by opening the faucet until the water stops flowing. This is the "Let’s get ready" phase—like warming up before a run. Next, remove the filters and the membrane, but keep them somewhere safe (you’ll reinstall them after the cleaning).
Now, here’s the fun part: you’ll use a sanitizing solution—usually unscented household bleach diluted with water, or a specialty RO sanitizer from the store. Remember, bleach is a friend, not a foe, but you need to use it sparingly. Mix about one teaspoon of bleach per gallon of water, then pour it into the system’s housing.
Let that solution sit for 15 to 30 minutes. This is the “magic time,” where the bleach works its invisible cleaning power on any bacteria lurking in the tubes and housings. While you wait, you can do a little dance, fold laundry, or just stare at the sink and marvel at modern plumbing—it’s your call.
Flushing: The Grand Finale
After the soak, it’s time to flush everything out thoroughly. Turn the water supply back on and let it run through the system (without the filters and membrane yet) for a solid five to ten minutes. You want every trace of bleach gone, because nobody wants their water to taste like a swimming pool.
How to Sanitize a Reverse Osmosis System (Easy Step-by-Step)
Once the bleach smell is totally gone, reinstall your membrane and the new filters. Pro tip: make sure your hands are clean when handling the membrane—it’s the delicate heart of your system. After that, run the faucet for another five minutes to clear any air and give everything a final rinse.
