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I've always heard it described as "burnt air." This is the best description I could find.

(Earlier version posted in the Spa forum, deleted by moderators, hopefully this is the right home for it. Apologies for that earlier violation of forum rules!) Five years ago I moved in with my girlfriend, now wife. She has a 1997 Hot Springs Prodigy spa. Her maintenance routine was to toss...

I use this ozone generator: DEL Ozone Hot Tub and Spa Eclipse CD Ozone Generator - ECS-1RPAM2-U. The first two have both quit at 14 months of 24/7/365 use, as measured by the ozone smell going away. I have not heard of Ozone generators lasting 2-5 years.

That ozone generator appears to be the UV type. Those used a fluorescent UV bulb that did not last long or generate much ozone. They have mostly disappeared from the market. The replacement technology is Corona Discharge (CD). In my experience they work very well, this is the model I buy: DEL...

I am an outlier who uses only ozone and nothing else (no chemicals, no tests). I can attest that it does indeed have an effect. I would say that your ozone generator is working and generating sufficient ozone if you can smell ozone when you remove the spa cover. Older UV ozone generators are...

Thank you for pointing out my error. Clear water means only that nothing is tinting the water brown, yellow or green or creating a film, to the limits of my vision. It's another coarse qualitative indicator like sniffing ozone. Thank you.

Matt, Please understand that I'm really grateful for you engaging with me on this. I've read dozens of your posts and learned from them all! You are correct. It's funny you should ask that. About 15 years ago, Tom Barr, an experienced aquarist who later earned a late-career PhD in...

Yes, it's certainly a lucky circumstance that the airtight seal, plus the continuously generated positive pressure of Ozone, is displacing the oxygen. There is also some regular qualitative testing going on: Test 1: We can smell the ozone. Ozone is present. No further test necessary. Test 2...

DelOzone Spa Eclipse Corona Discharge, 50-70 mg/hr, about $92 now on Amazon https://www.delozone.com @JoyfulNoise, Thank you for your advice!

I'm a long time aquarist, kept large planted aquariums with added CO2 and macronutrients, etc. Not relevant here except I'm accustomed to measuring and adjusting water chemistry. Everything I know about spas I learned from this forum during the last few weeks. So a couple of years ago I moved...