This link describes a system using copper and silver... http://members.tripod.com/hightechwater/whatis.htm
Here is an interesting excerpt from the site above: "When copper and silver ions are released into the water, these cationic, surface-active ions are a potent biocide. The disinfection action takes place when the positively charged copper and silver ions form electrostatic bonds negatively charged areas on the microorganism cell walls. These electrostatic bonds create stresses which lead to distorted cell wall permeability, minimizing the normal intake of life sustaining nutrients. Once inside an algae cell, copper and silver attack sulfur containing amino acid residues in the proteins used for photosynthesis (the process of converting light into usable food and energy). As a result, photosynthesis is blocked and lead to cell lysis and death. If the algae cell manages to live, the reproduction process is hampered by the presence of the copper ions and the spread of algae is held in check. Bacteria is killed, rather that suppressed. " Regards, George Martin On Tue, 13 Jun 2000 09:16:10 EDT, gd...@aol.com wrote: =>In a message dated 6/13/00 7:58:56 AM Central Daylight Time, n...@bestweb.net =>writes: => =><< What is the best combination and source of substances for purifying hot =>tubs => and swimming pools? I suspect a combination of ozone and colloidal silver => would be best, >> =>I would investigate using hydrogen peroxide for this purpose. It is easy to =>add to the system, can be monitored easily, and the cost is reasonable if you =>locate a chemical company where you can buy it in larger amounts like 30 =>gallons at a time. I have a address where you can get some very interesting =>information on this at a very low cost. => =>Gene Downey => => =>-- =>The silver-list is a moderated forum for discussion of colloidal silver. => =>To join or quit silver-list or silver-digest send an e-mail message to: =>silver-list-requ...@eskimo.com -or- silver-digest-requ...@eskimo.com =>with the word subscribe or unsubscribe in the SUBJECT line. => =>To post, address your message to: silver-list@eskimo.com =>Silver-list archive: http://escribe.com/health/thesilverlist/index.html =>List maintainer: Mike Devour <mdev...@eskimo.com> => =>