I actually know what a halide is, chlorine is a halide and a human poison, your glands will suck it up thinking that it is iodine as that is the only halide humans need, chlorine causes glandular failure and cancer... you ever smell chlorine?... guess what you are inhaling that shit right into your lungs and your blood is soaking it up! If you want to use a halide to sterilize a pool that humans actually need use iodine!