Here’s the jaw-dropper: the pores in a reverse osmosis membrane are roughly 0.0001 microns wide. Let me write that out in normal English: zero-point-zero-zero-zero-one microns. That’s like having a bouncer at a club who only lets in molecules that are basically invisible.
To wrap your brain around it: a human hair is about 70 microns thick. So the RO pore is seven hundred thousand times smaller than a single strand of your hair. If you tried to fit a hair through that pore, the hair would laugh and then disintegrate out of sheer embarrassment.
Most bacteria? They’re about 0.5 to 2 microns big. Viruses? Usually 0.02 to 0.4 microns. So yes, an RO membrane can literally block viruses. It’s like using a fishing net that catches individual atoms. Wild.
Wait, So It Kills Everything?
Not exactly, and here’s where the science gets sassy. The membrane doesn’t “kill” anything. It’s a physical filter. Think of it as a very rude doorman who says, “Sorry, you’re too big. Go away.”
Viruses, bacteria, lead, arsenic, even the fluoride your dentist loves—all of them get bounced because they’re bigger than 0.0001 microns. Even some dissolved salts get rejected because they’re too clunky to squeeze through.
But here’s the crazy part: if you were a water molecule (H2O), you’d be exactly the right size to slip through. You’re basically the VIP guest. Meanwhile, that chlorine molecule is stuck outside, crying into its tiny molecular beer.
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