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Though the risk is low in a residential pool, having UV and metal ions alone will not prevent some bacteria from growing on pool surfaces and not getting circulated to the UV to get killed nor will it kill fecal bacteria faster than they can get transmitted from person-to-person. Copper ions at pool concentrations won't even prevent bacterial growth for fecal bacteria or any bacteria that can survive in blood because such bacteria can readily tolerate the 0.8 to 1.1 ppm copper ion concentration found in blood serum. Silver ions do a better job in this area for bacteria though are still slow to kill and neither copper nor silver are effective against viruses or protozoan oocysts. Both can stain pool surfaces (especially plaster) unless one controls their concentration and the pH.
Copper ions in sufficient concentration are good algicides, but are not disinfectants and neither copper nor silver on its own passes EPA DIS/TSS-12 though the combination of silver ions with MPS does pass this test but only at hot spa temperatures and is the basis for the "low chlorine" recipe of Nature2 with MPS for spas/hot tubs (but not for pools where it is not an EPA-approved disinfectant without chlorine).
I have combined Low Pressure UV with ionization (copper/silver) and have had great success. I have a number of pools with that combination and I have not had to use chlorine for over a year now.
NSF Standards has approved ionizers with copper and silver for residential use. I am not sure the Nature II has tested with NSF.
We like it!
I was looking for a way to build a residual of some form of sanitizer. I completely understand the difference between your UV system and Ozone generation. A Mazzie injector allows up to 99.9% of the Ozone to be dissolved into the water. My thinking was to provide the ozone as the oxidizer to destroy amonia compounds and the Nature2 to provide the residual in the main body of water, thereby completely eliminating the need for chlorine or bromine.
Jon Laliberte said:
Actually Nature 2 or Copper/Silver Ion would not be overkill because you do need a residual IN the pool itself. Neither Ozone nor UV will do that. It would probably be underkill because the kill rates for these systems is too slow I think. Residentially maybe, Commercially never. They could be considered a nice supplement to the chlorine perhaps. I often wonder how the extreme oxidation from Ozone would affect these products and also the probable random or maintainence doses of Sequestering agents used in Commercial Pools.
You are still confusing Ozone with Germicidal UV. They are completely different! In your example, the Nature 2 would be over kill. And can you explain to me what a Mazzie injector is?
Thanks!
Chris Lightenberg said:
Our customers really enjoy the peace of mind knowing that 99.9% of organisms that flow through the reaction chamber are rendered inactive before they flow out the other side. The ease of care is a plus. In fact it is an up-sell on opening for our service department.
I have heard that there are studies showing organisms recovering from LP light, but I have not personally seen these studies. Jon, if you have links to those studies or other information maybe you could share?
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