Here’s where we get sneaky. A pristine RO membrane will remove bacteria. But what if your membrane has a microscopic tear? Or, more commonly, what if the bacteria accumulate on the “dirty” side of the membrane and start growing?
Can Reverse Osmosis Remove Bacteria at Savannah Holroyd blog
This is called biofilm, and it can allow bacteria to sneak past over time. This isn’t a failure of the RO, just a reminder that no single technology is a magic wand. The solution is simple and fun: most RO systems come with a pre-filter and a post-filter. The pre-filter catches bigger gunk, and the post-filter (often carbon or UV light) zaps any stragglers.
Think of it as a three-layer security system: first, the brawny pre-filter, then the ninja membrane, and finally the UV light that sings a little “goodbye” song to any remaining microbes.
Should You Rely Solely on RO for Bacteria?
If your water source is a well that tests positive for coliform, you don’t just want removal—you want complete annihilation. That’s why experts often recommend pairing RO with a UV disinfection lamp or a chlorine injection system before the RO membrane.
Why? Because UV light or chlorine kills the bacteria instantly, so they never reach the membrane alive. This makes your water not just pure, but absolutely pristine—the kind of water that makes you want to pour yourself a glass just to admire it.
Does Reverse Osmosis Remove Coliform Bacteria?
