> (like those 5000 ppm specialized ones) Those also come with a warning to only use it once a week, and to limit contact to 2-5 minutes. At least, all I’ve see

> (like those 5000 ppm specialized ones) Those also come with a warning to only use it once a week, and to limit contact to 2-5 minutes. At least, all I’ve seen in Germany. edit: Okay, apparently those I’m talking about have 12,500 ppm, I don’t know about 5000 ppm as I have not seen those.