CliniPool / Understand your water
Active oxygen: the gentle sanitiser (and its limits)
- Active oxygen (peroxide) sanitises and oxidises, with great comfort: no smell, gentle on skin and eyes.
- Its weakness: low persistence — it acts fast but doesn't last, especially in hot or sunny water.
- Often used in small volumes (hot tub), as an occasional backup, or paired with another sanitiser.
- Also used to reduce excess chlorine (neutralisation) — a distinct technical use.
Active oxygen — peroxide-based — is the comfort sanitiser par excellence: no smell, gentle on skin and eyes, pleasant to live with. That’s what makes it popular, especially in hot tubs and among people sensitive to chlorine. But comfort has a technical trade-off you need to know about: it’s not very persistent. It acts fast and well in the moment, but doesn’t “hold” long in the water — especially in hot or very sunny water. The result: it suits small, closely watched volumes (hot tub) well, occasional uses or ones paired with another sanitiser, but rarely solo on a large outdoor summer pool. The CliniPool app knows in which cases it shines and where it reaches its limits.
The upside: comfort
Where chlorine always ends up smelling (the famous chloramines) and stinging the eyes in an enclosed space, active oxygen stays discreet and gentle. No pool smell, little irritation: for a covered hot tub or a swimmer with sensitive skin, it’s a real comfort argument. It also oxidises organic matter effectively, which makes it a good backup “cleaner” after a heavy swim.
That’s why you mostly find it in hot tubs, in comfort treatment, or as an occasional relief for a main sanitisation.
The limit: persistence
Active oxygen’s Achilles’ heel is duration. Chlorine leaves an active reserve that protects the water between interventions; active oxygen, by contrast, acts then runs out quickly. On a large volume exposed to sun and use, that low persistence leaves windows of under-sanitisation where algae and bacteria can take hold. Hence the rule: excellent in a small, well-watched volume, to handle with care (or as a complement) on a large outdoor pool.
This weakness demands close follow-up: with active oxygen, you test more often, because the protection doesn’t last. The app sets the testing rhythm accordingly.
A separate technical use: neutralising chlorine
Active oxygen has a second hat, purely technical: peroxide reduces chlorine. It’s very useful when a shock treatment has pushed the chlorine too high and you want to speed up the return to swimming without waiting for the natural decline. But it’s also a trap: unintentionally combining active oxygen and chlorine cancels the sanitisation. Any pairing must therefore be controlled and calculated — exactly the kind of interaction the app builds in so it never has you neutralise your sanitiser by accident.
In one sentence
Active oxygen is the gentle, odourless sanitiser: perfect in a hot tub and as a backup, to watch closely because of its low persistence, and precious for neutralising excess chlorine. The app knows when it suits, how often to test it, and how to combine it with other treatments without a false note.
Frequently asked questions
Can active oxygen replace chlorine?
On a small, closely watched volume (hot tub) or for occasional use, yes; on a large outdoor pool in high summer, it's risky because it isn't persistent enough — it doesn't 'hold' between additions. It's often used as a complement rather than a full replacement.
Is active oxygen really gentler?
On comfort, yes: no characteristic smell, little eye and skin irritation, which is a big draw in a hot tub. But 'gentler' doesn't mean 'more effective': its sanitisation is less persistent, so it demands close follow-up.
Can you mix active oxygen and chlorine?
Careful: active oxygen (peroxide) reduces chlorine — it's even used to lower excess chlorine. Combining them unintentionally cancels the sanitisation. Any pairing must be controlled, which the app handles in its calculations.
Is active oxygen used to lower chlorine?
Yes, it's one of its technical uses: peroxide neutralises excess chlorine. It's handy when a shock has pushed the chlorine too high and you want to speed up the return to swimming — a calculation the app can do.