Can Ozonators Damage My Hot Tub Cover?

Most hot tubs today come with the added convenience of an ozonating system already installed. It’s a great selling point for the hot tub manufacturers and dealers to the customers. They sell it as a maintenance free system. The question is, is it a maintenance free system and can an ozonator cause any damage?

The quick answer is no an ozonator although a helpful addition to oxidizing your hot tub water, is not a stand alone system for oxidizing hot tub water. You still need a chlorine or bromine chemical system in combination with an ozonator to oxidize your hot tub water. Many customers think that an ozonator is all they need to oxidize their hot tub water. This of course is not the case, and can be dangerous if used this way. Often hot tub owners are unaware if their ozonator is actually working or not, and in a lot of cases ozonators are not working and aiding in the oxidization process of your hot tub.damaged hot tub cover

Another issue with ozonators is the damage they do to hot tub covers or spa covers. When an ozonator is working it is constantly making ozone gas which settles between the top of the hot tub water and the underside of the hot tub cover. with the seal of the hot tub cover the gas has no where to go, and although the ozone is mild over time it does cause significant damage to your hot tub cover. In particular the ozone will deteriorate the poly vapor seal of a hot tub cover, leaving the foam core unprotected and open to water saturation. This is a huge problem for hot tub covers and it doesn’t take long to break down and ruin your hot tub cover, it can happen in half a year.

The best two ways to protect your hot tub cover from the ozonator damage is to lift your hot tub cover daily and let the ozone release, or purchase a thermal or solar cover to float on the top of your hot tub water keeping in the ozone. A combination of both solutions is the best way to protect your hot tub cover from ozone damage. To make it easy on you to remove and put on your hot tub or spa cover you may want to consider having a good hot tub cover lifter system installed. There are many choices in hot tub cover lifters on The Cover Guy site to choose from. Not dragging and pulling your hot tub cover off and on also helps protect the hot tub and spa covers.

hot tub covers


  1. Wyococote December 15, 2012 at 2:53 pm

    Very interesting to see this perspective on ozone and covers, especially with the cost and importance of a cover. Don’t see this on the sites selling aftermarket ozonators much, hmm.
    I’m “fixin’ to” replace my old ozonator that is kaputz with a newer one that is higher output (delzone md-50). I find working ozonation plus clorine and silver and frequent filter cleaning make for a very clean low chemical soak. When the ozone stops functioning, I see a noted difference(must use more clorine more often) My Hotspring Sovereign sees a lot of use, since my mother brought me up right and taught me how to share. So I’ve read and understand your FAQ. Am now concerned. Would prefer not to have the extra hassle of a thermal or solar cover to remove and put back in, though i infer this might insulate better my tub, and perhaps have the ozone work a bit more effectively. Aren’t modern tubs designed for the correct parts per million of O3??? Ive seen a fancy “mixing jar” for larger pools so the ozone becomes oxygen further down the line. Looked kind of pricy. I did indeed have to replace my last cover due to it’s becoming waterlogged on one side, though I saw no evidence of the vapor barrier ( just a plastic sheet between the vinyl and Styrofoam? )having deteriorated. so I guess my question is, is there a predetermined ppm of ozone for a specific tub based on gallons and i suppose flow, that does a good job oxidizing nasty things without oxidizing my cover, let alone me? With your permission i may put a link or cut and paste your FAQ to spaforums. Peace

  2. john mclarens October 25, 2011 at 3:36 pm

    How much do these thermal or solar covers cost?Ive had my cover a few months and is showing a few dark spots

    1. The Cover Guy October 26, 2011 at 7:59 pm

      Hi John,

      The solar covers are $24.99 and the thermal covers are $89.99 you can call Lisa at The Cover Guy to order 866-585-0056 x 202 The other thing that will definitely help is removing the hot tub cover at least once a day so the chemicals are released from under the hot tub cover. For sure the best solution is the the floating covers mentioned above.

      1. Greg Ilkka November 30, 2011 at 3:58 pm

        I don’t see a “thermal cover” for $89.99 on the accessories page?

      2. The Cover Guy December 2, 2011 at 12:33 pm

        Hi Greg, your right we have to put that cover on the page. You can call into the office to order as well at 1-866-585-0056 x 204 and ask for Amanda.

        ~ Jay

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