The Alternatives to Chlorine?

Chlorine gas is dangerous. It's probably not going to be phased out anytime soon. You could use you could just start pumping the water supply full of what's the word? Anti bacterial stuff. That was what I'm looking for. We make the pipes out of copper. Pump copper through a tail. And timiny. With the world, that's your problem crew given entire town heavy metal poisoning. Can I lay down now, please? Yes, go. Bye everybody.