Bleach is said to be bad for humans and bad for sewage systems but I see a lot of people use and recommend it, why?
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I think the benefits of bleach are covered. Some of the potential harm is when the chlorine in bleach mixes with organic matter in the environment (sewage being treated then discharged to the environment). Chlorine can combine with organic molecules and form some really nasty stuff like trihalomethanes, chloramine, etc. Those chemicals are toxic, carcinogenic and can cause reproductive problems, all around nasty business. So, if you can get away with a less toxic disinfectant, awesome. I still use bleach when only bleach will do. Better though I have a stabilized aqueous ozone generator to make a disinfectant solution that degrades to water and oxygen, no toxic byproducts, but not as cheap as bleach.
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