You step out of the pool and your hair instantly feels different — rougher, drier, harder to manage. That change doesn’t happen by accident. Pool water, especially chlorinated water, can significantly affect your hair’s structure, moisture balance, and long-term health.
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Chlorine strips away your hair’s natural protection
Your scalp naturally produces sebum — an essential oil that keeps hair smooth, flexible, and protected. Chlorine acts as a strong oxidising agent, removing these protective oils the moment your hair comes into contact with pool water.
As this barrier weakens, the outer layer of the hair shaft — known as the cuticle — begins to lift. Hair becomes more porous, loses moisture faster, and starts to feel dry and coarse after repeated exposure.
This is often why hair suddenly feels harder to soften during swim season, even with regular conditioning.
Why your hair loses shine after swimming
Healthy hair reflects light because the cuticle lies flat and smooth. Chlorinated water disrupts this surface, causing the cuticle to roughen and swell.
The result:
- Hair feels rough to the touch
- Tangles more easily
- Appears dull and dehydrated
- Loses its smooth, glossy finish
Dullness is not always a sign of unclean hair — it’s often a sign of structural damage.
Swimming can alter your hair colour
Many people blame the sun when their hair tone changes during summer, but pool water plays an equally important role.
Chlorine oxidises trace metals, particularly copper, commonly found in swimming pools. These particles attach themselves to the hair shaft and gradually affect colour tone.
In lighter hair, this may appear as a green tint. In darker hair, it often shows up as brassiness, faded richness, or a flat, lifeless tone.
Colour-treated hair is especially vulnerable because chemically processed strands absorb minerals more easily.
Chlorine weakens the internal protein structure
Hair strength depends on protein bonds within the strand, particularly disulfide bonds that help maintain elasticity and resilience.
Repeated chlorine exposure weakens these bonds over time. Once compromised, hair becomes more fragile and less able to recover from styling, heat, or humidity.
The damage begins before you can see it
One of the biggest misconceptions about chlorine damage is that it becomes visible immediately. In reality, chlorine generates free radicals that slowly degrade keratin proteins and the lipid layer protecting the hair shaft.
By the time dryness, rough texture, or breakage become noticeable, the damage has usually been developing for weeks. That’s why preventative care matters far more than repair alone.
How to protect your hair before and after swimming
A few small habits can significantly reduce chlorine-related damage:
- Wet your hair with clean water before entering the pool
- Rinse immediately after swimming
- Use sulphate-free cleansing products like deSal’s Swimmers Wellness Shampoo
- Deep condition regularly to restore moisture and elasticity
- Limit excessive heat styling after swimming
For colour-treated, chemically treated, or naturally dry hair, professional bond-repair and hydration treatments can also help maintain strength and softness through the swim season.
Healthy hair isn’t just about styling — it’s about protecting the structure beneath the surface.
Shop Swimmers Wellness Shampoo →
deSal makes Swimmers Wellness Shampoo, formulated to lift chlorine and pool minerals from hair after swimming.
How soon the damage starts, and what actually reverses it
The oxidation begins in the pool, not days later. Chlorinated water strips the thin sebum layer that normally shields the cuticle, and once that is gone the water reaches the keratin underneath. Swim four or five times a week and the fibre never gets a chance to recover between sessions, which is why regular swimmers see roughness and split ends long before anyone else does.
Rinsing with plain water helps less than people assume. It dilutes what is sitting on the surface but does nothing about chlorine that has already reacted with the hair, and nothing at all about copper. Removing those needs a wash that binds them, which is what a chelating agent and a stable vitamin C derivative do: one grabs the metal, the other reduces the residual chlorine to harmless chloride.
Pre-swim, the step most people skip
Soak your hair in clean tap water before you get in. Hair takes up only so much water, so a strand already saturated with clean water absorbs far less pool water. It costs thirty seconds and it is the single cheapest thing a swimmer can do. A leave-in or a light oil on the lengths adds a second barrier.
FAQ
What does chlorine do to your hair? Chlorine strips the sebum that coats each strand and oxidises keratin. The result is hair that feels dry and rough, tangles easily and snaps more readily.
Why does swimming turn hair green? Chlorine is not the cause. Dissolved copper in pool water binds to the hair and casts a green tone, which shows up most on light or colour-treated hair.
How do I get chlorine out of my hair? Rinse with clean water as soon as you leave the pool, then wash with a shampoo that neutralises chlorine rather than only lifting oil. Stable Vitamin C converts chlorine into chloride, which rinses away.
Should swimmers wash their hair after every session? Regular swimmers usually do, so the wash itself has to be mild. A gentle, mildly acidic formula matters more than trying to wash less often.
Does rinsing with plain water after swimming remove chlorine? Only partly. A plain rinse dilutes what is on the surface but does not remove chlorine that has already reacted with the keratin, and it does not remove copper at all. That needs a wash with a chelating agent and a reducing agent such as a stable vitamin C derivative.
What should swimmers do before getting into the pool? Soak your hair with clean tap water first. Hair can only absorb so much water, so a strand already saturated with clean water takes up much less chlorinated pool water. A leave-in conditioner or light oil adds a further barrier.
Sources
- Green hair is copper, not chlorine: sciencealert.com/its-not-chlorine-that-turns-hair-green-in-pools; pmc.ncbi.nlm.nih.gov/articles/PMC11627536/
- EDTA chelation mechanism: scienceinsights.org/what-is-edta-a-chelating-agent-with-many-uses/
- Shampoo pH, cuticle friction and breakage: pmc.ncbi.nlm.nih.gov/articles/PMC4158629/
