I finally bought into the hype around those UV sanitizer boxes for phones and got proven dead wrong in 2 weeks flat

After my buddy in Austin swore by his $30 one for killing germs I figured it was snake oil but I tested it with those little bacterial culture discs my niece uses for her science fair stuff and the results were almost identical to the control dish so what other cheap disinfection hacks have actually held up under real scrutiny for you all?

4 comments

4 Comments

the_jake9d ago

Hold up on those culture discs though. Those science fair kits aren't really made for testing UV light, they're for basic handwashing stuff. The UV boxes work by damaging the DNA of bacteria over a certain amount of time, not just zapping them fast. You need a proper lab setup to see if the germs actually died or just got stunned for a bit.

felixlane9d ago

Yeah that's a fair point. I've seen people assume UV kills everything instantly when really it's about exposure time and intensity. Those cheap germicidal lamps in the little boxes can be pretty weak, and a standard agar plate isn't going to show the difference between dead and just stressed bacteria unless you run a control with a dark area. It's frustrating because a lot of these kits don't come with any real guidance on how to set up a proper experiment, so you end up with results that don't actually prove anything. You'd have to incubate the plates afterward and compare growth between the exposed and covered sections to get any meaningful data. I respect you pointing that out, it's the kind of detail that matters if someone's trying to actually learn something.

jenny1989d ago

Honestly, I get what you're saying about the control and incubation stuff, but is it really that deep? I've seen people mess around with those cheap UV wands and get visible results on agar plates in like 10 seconds. Not scientific, sure, but the bacteria clearly stopped growing where the light hit. Unless the whole plate was contaminated from the start or something, I'm not convinced you need a full lab setup to see if a UV light works. It feels like overthinking a simple test.

wendy_lee489d ago

Different take on this. The visible clearing on agar doesn't necessarily mean the bacteria are dead, just that they can't divide right away. Incubation is the only way to tell if they're truly killed or just temporarily stunned.