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I am led to belive that a CD 03 system produces significantly much more 03 than a UV system, and at a much lower cost per weight.There is some debate over if a 03 system is effective at all, however, I see a trend of folks who are running a CD system 24/7 with a contact chamber consistantly reporting good results, and the poorer results seem to more amoung folks with UV, aftermarkert units (no contact chamber) or units not running all the time (or any combination of the latter 3). I have no data to back that claim up and is more my personal impression. FWIW I have a CD 03 unit and I like it. There is a TON of info on the web concerning 03. http://www.ozoneapplications.com/info/cd_vs_uv.htmhttp://www.coolantconsultants.com/ozone_technologies.htmOr google "Ozone" Ozone Uv vs CD It may help, or just confuse you even more. I thought all of the national tub makers switched to CD and dropped the UV systems?