Chlorine in Shower Water: What It Does to Your Skin and Hair
By Sam Mendez — Chartered Process Engineer (CPEng NER), Engineers Australia
Most people who think about water quality start at the kitchen tap. It makes sense — it's the water you drink. But from a process-engineering point of view, your shower is where the more significant chlorine exposure usually happens, and it's the part almost nobody filters.
To be clear up front: the chlorine in your water is there on purpose, and Australian mains water is safe. (I've written about why Australia's tap water is genuinely world-class if you want the full picture.) This isn't about danger. It's about comfort — and about understanding why a hot shower behaves so differently from a glass of water.
Why the shower exposes you to more chlorine than the tap
Three things change in a shower that don't apply when you pour a glass of water:
- Heat. Hot water drives chlorine and its volatile by-products out of the water and into the air as vapour. In a glass of cold water, most of it stays dissolved.
- Surface area and time. A shower spreads warm, chlorinated water across your entire skin surface for several minutes. Skin is in contact with warm water for several minutes.
- An enclosed space. A shower cubicle traps that vapour, so you breathe in the volatilised chlorine and trihalomethanes (the by-products formed when chlorine reacts with organic matter) along with the steam.
None of these levels are unsafe in a compliant municipal supply. But inhalation and skin contact in a hot shower are a real exposure route — and they're the route most people never address.
What chlorine can do to skin and hair
Chlorine is an oxidiser. It's very good at its job in the distribution network, but the same chemistry that keeps water safe also strips the natural oils — sebum — that protect your skin and hair.
Skin
For many people, regular hot showers in chlorinated water can contribute to dryness, tightness and itchiness, particularly in winter or in harder-water regions. If you already have sensitive skin, chlorine can be one more thing aggravating it. This is a comfort and feel issue — not a medical claim — but it's one a lot of people notice once it's gone.
Hair
The same oil-stripping effect can leave hair feeling dry, brittle or frizzy, and it's particularly relevant if your hair is colour-treated — chlorine can accelerate fade and dullness. Anyone who's noticed their hair behaving like it does after a swim in a chlorinated pool is seeing a milder version of the same thing.
What a shower filter actually changes
Here's where I'll stay strictly within what the chemistry supports. A quality shower filter is designed to reduce the free chlorine in your shower water before it reaches your skin and before it volatilises into the air you breathe. The media that do this — calcium sulfite, KDF and activated carbon — are well-established for free-chlorine reduction. The filter is less effective on chloramine than on free chlorine, so if your supply is chloraminated (much of Melbourne is), expect a smaller difference.
In practice, that means shower water that's gentler on skin and hair, with noticeably less of that chlorine smell in the steam. That's the honest, defensible benefit — and for most households it's the whole point.
What it won't do
A shower filter is not a reverse-osmosis system. It won't remove fluoride, PFAS or microplastics, and it doesn't need to make your water microbiologically safe — your water authority has already done that. If a brand promises a shower head will strip all of the above, treat that with healthy scepticism. We'd rather tell you exactly what ours does.
Is it worth filtering your shower?
If you have sensitive or dry skin, colour-treated hair, young children, or you simply notice the chlorine smell in a hot shower, the comfort difference is the kind of thing you feel quickly. If none of that applies to you, it's a refinement rather than a necessity — and I'd rather you know which camp you're in than be sold fear.
If it sounds like your situation, the AQVO Shower Filter is engineered specifically for chlorine reduction at the showerhead, with no plumbing required.
Frequently asked questions
Do you really absorb chlorine through your skin in the shower?
Yes — warm water and several minutes of contact make skin a real exposure route, and in a hot, enclosed shower you also inhale chlorine and its volatile by-products in the steam. Levels in compliant mains water are safe, but the shower is a more significant contact route than drinking water.
Can chlorine in shower water dry out my skin and hair?
It can. Chlorine strips the natural oils that protect skin and hair, which for many people contributes to dryness, tightness and brittle or faded hair. Reducing chlorine at the showerhead is what addresses this.
Does a shower filter remove fluoride or PFAS?
No. A shower filter reduces free chlorine, and is less effective on chloramine. Removing fluoride, PFAS or microplastics requires different, certified technologies such as reverse osmosis. AQVO doesn't claim otherwise.
Is it safe to shower in Australian tap water?
Yes. Australian mains water is treated and monitored to among the strictest standards in the world. Filtering your shower is about comfort — softer feeling water, less dryness, less chlorine smell — not safety.