this post was submitted on 30 Nov 2023
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Every source I can find says that closing the lid is better.
For reducing visible particles, not the nano particles which have a higher concentration. Regardless it's all kinda moot as neither produce levels of bacteria that could realistically get you sick unless you stick your face above the bowl or to the side openings by the lid while flushing and that person has an infecfion. Just wanted to clarify the science behind it.
https://microbiologysociety.org/news/society-news/does-putting-the-lid-down-when-flushing-the-toilet-really-make-a-difference.html#:~:text=The%20research%20found%20that%20putting,the%20bacteria%20in%20these%20droplets.
The highlighted section of that link reads as follows:
The article doesn't indicate whether the total bacteria contained in the now larger and more concentrated droplets is thought to be comparable to that contained in the full spray of open-lid droplets, which means a precise comparison isn't available, so technically I guess it could go either way. However, common sense tells us that many of those microorganisms will either get stuck to the underside of the lid or fall back into the water, so it seems nearly impossible that closed-lid flushing could spray 100% of the microorganisms that open-lid flushing does, right? So if the best (seemingly unlikely) scenario for open-lid flushing is that maybe it only sprays the exact same number of farticles into the air, then what's the appeal?
Hmh, what do we make of that?
Simulation from 2020: https://doi.org/10.1063/5.0013318
Laser supported analysis from 2022: https://doi.org/10.1038/s41598-022-24686-5