Thankfully we no longer have a pool, but over twenty years of tending one makes me wary of what goes in one! In addition to chlorine products, I remember adding algaecides of various types and a number of products to increase or reduce the PH. It seemed we were constantly adding chemicals to make something "right." It is inevitable that swimmers would swallow some water, so I guess a little would not kill you, but no way would I want to drink it routinely except in an extreme emergency.