jtconte

Thanks for the link Jerimiah! Interesting that right on that page it says: "1) Corona Discharge (CD) units produce Ozone for six months; 2) Electromagnetic (transformer) driven Ultra Violet (UV) units produce sufficient Ozone to treat spa water for two to three years; and, 3) Electronic UV units last four plus years. Field tests have verified these findings."

Yes, it doesn't make sense that they would change out the CD for a UV system. I will get this clarified. So how do you know when to change the CD? Is there a test?

With UV you can see the glow and know the bulb is functioning but how do you tell with CD?

Hi, I'm new here and am looking into a first time spa purchase. After visiting here for awhile I went to a local dealer who carried Hot Spring and Sundance. Both seem highly regarded here. I'm a bit confused because the salesperson said that they don't like Corona Discharge and that their Hot Spring spas come with a UV system. Is that possible? I don't see that at the Hot Spring website. The salesperson said that the UV lasted longer and was cheaper to maintain. Is one better than the other? Thanks, John