Reactive chlorine ions will dissipate, BUT the bound Cl ions and chlorine biproducts such as trihalomethanes will not. They are stable, bioaccumulative, and suspected carcinogenic and mutigenic. Search trihalomethanes on the web.
Amount on THMs produced is dependent on amount of chlorine applied and amount of dissolved organic substances in the water which pond water has huge amounts of dissolved organics compared to drinking or well water.

One info source.
http://wellowner2.org/2009/index.php?opt...g&Itemid=35

Last edited by Bill Cody; 08/30/11 01:05 PM.
aka Pond Doctor & Dr. Perca Read Pond Boss Magazine -
America's Journal of Pond Management