I was interested to see a company here offering a non chlorine pool additive, 
haven't checked the details yet .....
  Subject: Re: CS>swimming pools using CS




    Better and more cheaply done with Colloidal Copper and Zinc
  See  Floatron [it's been around since the 70s ]

  
http://shop.solardirect.com/product_info.php?cPath=25_121&products_id=234&gclid=CNn1zqfx9rMCFQWnnQodbUMANw