It's funny this thread should appear regarding having friends chlorinate the pool and complaining about bleaching their clothes. I've been recently using Dichlor as my chlorine source because my CYA is low. I discovered that at least for the brand I am using, the granules don't completely dissolve quickly. They would settle to the bottom of the pool even when added slowly over a return flow. So I then got a plastic container with a lid (it used to contain bird seed) and used it to premix the Dichlor with pool water. Even doing this, it would take several fill, mix, pour to get it all dissolved. It also smells different in the pool and the pool water tastes different for a day or two -- perhaps some other binder material???

Lo and behold, I discover the next day that my dark socks that I was wearing when I did the above Dichlor addition have bleach splotches. The container I used for mixing leaked at the top during the mixing (it was designed for solids -- bird seed -- and not for liquids) and I recall some of it spilling out but didn't think immediately about it as if it were bleach.

File this under "it happened to me; it could happen to you"! Ironically, I haven't had any incidents when using chlorinating liquid since I'm consciously much more aware of its bleaching potential so am very careful when pouring and handling drips on bottle edges.

Richard