They were explicitly sold as humidifier sanitizer by "respectable" companies, so people believed it was safe. It's like buying a dish soap - you'd assume that

They were explicitly sold as humidifier sanitizer by "respectable" companies, so people believed it was safe. It's like buying a dish soap - you'd assume that whoever's made the product did the necessary certification to show it won't kill you. I also bought a bottle of these sanitizer (had two toddlers then), put it into the humidifier a few times, but I was too lazy so that was about it. My laziness probably saved my kids' lives.