We have a tap (hot/cold) with an ozone injector in the pantry. For people that want to know why - it's the greenest way to kill bugs in the kitchen, especially the bench top.

  • I seem to recall that when we first got it, I could smell the ozone
  • I can't smell anything now.
  • The red led indicates standby.
  • Blue led is visible on the tap, when you run it - indicating it's working.
  • Similarly, the controller shows a blue led under the working label when the tap is running.

How can I tell that ozone is being produced? Is there some test I can perform?

It is 6 years old and we were the second user of this tap, in New Zealand. The intention is that it injects some ozone into the water. I used to get a tiny whiff if I had a glass of water near my nose. Note that

  • It's not for drinking, in the photo you can see the drinking tap on its's left (right of the photo).
  • It is for cleaning only.
  • It does come with a warning that if you wanted to drink it, then leave it standing for 10 minutes.

It's not more dangerous or safer than chlorine. And chlorine is used everywhere - in the pools and in urban drinking water. We are in a rural area with water from concrete rainwater tanks. When in urban areas, we choke on the tap water - the chlorine is so bad (worldwide)!

Maybe it's us on this side of the world, but our spa pool and swim-spa both came with ozone disinfectants built-in. And I have the same question about their longevity.



  • Purposely electrifying drinking water so that it produces a mutagen, what could go wrong?
    – dandavis
    Jan 19, 2023 at 2:02
  • @dandavis - why is everyone being negative ? It's not for drinking. It's for cleaning. It's as safe or dangerous as chlorine and as effective. And no one cares about hopping into a pool, which is way more harmful. Ozone is not leaking everywhere, there used to be a slight whiff in a glass of water. Jan 19, 2023 at 2:05
  • I think people are/were getting the impression that it somehow causes ozonated water to come from the same faucet where you get drinking and cooking water; most of us don't have a faucet that spits out cleanser. Maybe your explanation needs to be clearer.
    – dandavis
    Jan 19, 2023 at 2:13

1 Answer 1


There are two easy options that I know of:

  1. Aqueous ozone test strips. At least one company makes them. Use your favorite search engine to find them. An example brand is SenSafe.
  2. An ozone test kit. A few companies make these. They look more precise but are also more expensive per test.

Oh, and if you can smell the ozone, it's not great. Ozone isn't good for your health in significant concentrations. I'm also suspicious of any claims that the ozone does anything other than treat the water headed through it. Don't treat it like sanitizer or bleach - if it was this simple to turn water in to something you could use for cleaning, every restaurant would be using such a dispenser instead of sanitizer solution.

  • Hey, I did a bit of reading and am coming around somewhat to this stuff. The big downsides appear to be: it's not quite as effective as other disinfectants, the equipment for it can be expensive, and it's tough to measure the quality of the produced aqueous ozone. Go figure, that's exactly the problem you are having. I'm sticking with conventional cleaners for now, but will keep an eye on this part of the market.
    – KMJ
    Jan 19, 2023 at 4:44
  • I wasn't looking for such an expensive kit, but there isn't anything else, so have ticked it. Jan 21, 2023 at 1:48

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