Chlorine and Dyed Hair: How to Swim Without Ruining Your Colour
Chlorine does not simply “bleach” your colour. It strips the natural oils that protect the hair, leaves the cuticle rougher and more porous, and lets colour escape faster. Coloured, bleached and keratin-treated hair feel this first. You can still swim. Wet your hair with fresh water first, wear a well-fitted swim cap, rinse straight after, and book colour with your swimming calendar in mind.
Below is the full routine, written for women swimming in Dubai and Sharjah, where the pool is part of daily life for most of the year.
TL;DR
- Chlorine dries out the hair and makes it more porous, so dyed hair fades faster and breaks more easily.
- Green tones in blonde hair come mostly from copper in the water, not from chlorine itself.
- Before swimming: soak hair in fresh water, add conditioner, and wear a snug swim cap.
- After swimming: rinse at once, wash the scalp with a sulfate-free shampoo, and deep condition weekly.
- Avoid fresh colour right before a swimming-heavy holiday, and leave keratin time to settle before you get in.
Table of Contents
- What chlorine actually does to coloured hair
- Why blonde hair turns green (and it is not the chlorine)
- Before you get in the water
- Your after-swim routine
- Timing your colour around your swimming
- Swimming in Dubai: what the pool rules mean for your hair
- Our perspective at Boost Beauty Lounge
- Booking colour that fits your swimming routine
- FAQ
- Sources
What chlorine actually does to coloured hair
Pools use chlorine to disinfect the water. In the process it strips away the natural oils that normally protect your hair, so hair turns dry, rough and dull and breaks more easily. That is true of any hair. Coloured hair starts from a weaker position.
Every colour service opens the cuticle to some degree. Bleach and lightener open it the most. Dermatologists quoted by UAB say that chemically processed hair, such as bleached or keratin-smoothed hair, is structurally more porous, so these clients see the effects of chlorine much faster than people with untreated hair. Cleveland Clinic adds that chlorine can degrade chemical bonds within the hair and speed up colour fading.
In practice, you notice three things:
- Fading. Warm tones go brassy or flat, and fashion shades lose their depth.
- Texture change. Hair feels straw-like, tangles at the ends and loses its slip.
- Shine that is not healthy. A glassy, over-smooth look can hide the fact that the strand is dehydrated.
Lighter and brighter colours show the change most. Balayage, highlights and ombre all include lightened sections, which are the most porous part of your head. If you are weighing up those techniques, our guide to balayage before and after explains what changes in the hair and how to plan it.
Why blonde hair turns green (and it is not the chlorine)
This is the question we hear most often from swimmers. The green tint is usually blamed on chlorine, but the real culprit is copper. According to UAB, copper deposits in pool water cause the green tint. Chlorine plays a supporting role: it makes the hair more porous, so copper from algaecides or corroded pipes binds more easily to the shaft. The effect is strongest in bleached or colour-treated hair with a compromised cuticle.
A case report in the medical literature describes green hair as insoluble copper deposits in the hair of blonde people, most often linked to the copper content of pool algaecides, though other causes exist.
Two useful conclusions follow:
- Lighter, more porous hair is the first to go green. Pale blondes, silvers and freshly lightened balayage ends are most at risk.
- A normal shampoo will not remove it. If hair turns green despite your precautions, experts suggest a chelating shampoo, which is designed to bind to and remove heavy metals such as copper, rather than a generic clarifying shampoo, which is made mainly for product buildup. Use it sparingly, because it can be harsh on coloured hair.
If your hair is already green, do not reach for more colour or a home bleach fix. Ask your stylist to assess it first.
Before you get in the water
The hair is a sponge. A dry strand soaks up whatever the pool offers. A strand that is already full of clean water has less room.
1. Saturate hair with fresh water
Cleveland Clinic reports that saturating hair with clean water before swimming can reduce the absorption of chlorinated pool water by up to 90%. Use the shower at the pool, and wet the hair from root to tip, including the ends, which are the oldest and most fragile part.
2. Add a layer of conditioner or oil
A light layer of conditioner, leave-in conditioner or oil over damp hair acts as a physical barrier. Many swimmers use coconut oil for this. Treat it as a bonus, not as full protection. Products help, but they are supplementary to a cap.
3. Wear a swim cap that fits
Practitioners often say that a well-fitted swim cap is the single most effective way to limit contact with chlorinated water, especially for highlights or balayage, and best of all combined with pre-swim wetting. That advice is reflected in Cleveland Clinic’s guidance on hair and chlorine. A cap that is too loose lets water in and gives a false sense of safety. Tuck every strand in, ends included.
4. Tie hair up and keep sessions sensible
Loose hair floating on the surface soaks up more water. A low, soft plait or bun under the cap keeps the ends protected. If you swim for fitness, shorter, more frequent sessions are no worse for your colour than one marathon swim, but each session needs the full routine.
Your after-swim routine
What you do in the first 10 minutes matters most. The research points to the same simple sequence: rinse immediately with fresh water, use a sulfate-free moisturising shampoo to clean the scalp, and apply a deep conditioner at least once a week to restore moisture.
- Rinse straight away. Do not let chlorinated water dry on your hair in the car or on the metro.
- Wash with a gentle, sulfate-free shampoo. Harsh detergents strip colour on top of the chlorine.
- Cleanse the scalp, not only the lengths. Dermatologists point out that people often forget the scalp. Chlorine can strip the scalp’s moisture barrier, causing itching and flaking and possibly worsening conditions such as scalp eczema. If you have eczema or persistent itching, see a dermatologist rather than treating it with hair products alone.
- Condition every time, deep condition weekly. Leave a mask on for the time on the label, then rinse in cool water.
- Detangle gently. Wet, porous hair snaps. Use a wide-tooth comb from the ends upward.
- Let it air dry or use low heat. After chlorine, the hair does not need extra heat on top.
If you swim often, UAB’s experts suggest alternating a gentle sulfate-free shampoo with a chelating shampoo, used no more than once a month or as needed. That manages mineral buildup and chlorine residue without drying the hair out. Do not use a chelating shampoo as your everyday wash.
For a longer walk-through of the weekly mask step, see our step-by-step guide to deep conditioning in Dubai.
Timing your colour around your swimming
The best protection happens at the booking stage. Fresh colour is at its most vulnerable, and the order in which you do things matters.
Before a swimming holiday
UAB advises that you avoid professional colouring immediately before holidays that involve frequent swimming, because fresh dye is more susceptible to chlorine-induced fading and damage. If your trip is next week, either book colour for after you return or do it well ahead and follow the aftercare closely. Tell your stylist your travel and swimming plans at the consultation, so she can choose the shade and technique accordingly.
After a colour service
Dermatologists stress that your home-care routine has to change immediately after chemical services, not when your hair starts to look dry. The first days after colour are the most delicate. Our article on protecting hair in the first 72 hours after colouring covers what to avoid, and a pool is firmly on that list. As a rule of thumb, we ask clients to stay out of the pool until the hair has settled, and to check with their stylist for their own timeline.
Lightening and swimming
The more lift your hair has had, the more porous it is. If you swim every week, ask about lower-damage ways to lighten, such as a bleach bath for a small lift. We compare the options in our guide to bleach bath versus bleach. If your hair has already snapped after bleach, this repair guide explains what to do next.
Keratin and swimming
Smoothing treatments are porous-hair treatments too, and they come with their own waiting rules before water, shampoo and pools. Follow your stylist’s timeline, and read how long to wait before washing hair after keratin. If you are planning keratin over existing colour, see why we wait 10 to 14 days.
Extensions in the pool
If you wear extensions, chlorine affects the bonds and the extension hair, which cannot be restored by your scalp’s natural oils. We wrote a 10-minute post-swim checklist for extensions for exactly this.
Swimming in Dubai: what the pool rules mean for your hair
Public pools in Dubai are regulated. Dubai Municipality’s public swimming pool guidelines require operators to keep disinfectant within set limits, and the document gives free chlorine levels of 1 to 4 mg/L depending on temperature. Water has to be tested daily for chlorine, pH and temperature, and recirculated regularly, which helps keep water clear and limits the minerals that lead to discolouration.
That is good news for safety, but it does not make a pool harmless for your hair. Regulated, well-run water still contains chlorine, so the routine above applies in a hotel pool, a gym pool or a community pool alike. Private villa and compound pools may be managed differently, and you cannot always tell how much copper-based algaecide is in them. If your hair turns green after one particular pool, that tells you something about that pool.
There is a Dubai-specific habit worth adding: the heat. Walking from a pool deck to the car in the sun with wet, chlorinated hair, then sitting in air-conditioning, is hard on porous hair. Rinse and condition before you leave, and keep a hair tie and a spare leave-in conditioner in your swim bag.
Our perspective at Boost Beauty Lounge
We see the same pattern again and again. A client books balayage, loves it, goes to the pool that weekend, and calls us two weeks later asking why her colour looks tired. The colour was fine. The aftercare was missing.
Here is how we think about it. Colour is not a one-day service. The first 72 hours decide how the colour settles, and your swimming routine decides how long it lasts. That is why our consultation covers more than shade. We ask how often you swim, how you wash, and whether you have a holiday coming up, then we plan the colour around your life. We would rather move an appointment than colour your hair a week before a beach trip.
We also give every client home-care instructions, because the best salon result can be undone by one unprotected swim. And we back our work: our packages come with a 10-day satisfaction guarantee, and you pay after the service is completed.
Our advice on swimming is simple. Wear the cap, wet the hair, rinse straight away, and do not wait until your hair feels dry to change your routine.
— Boost
Booking colour that fits your swimming routine
If you are planning balayage, highlights, ombre or full colour in Dubai, our Hair Package at 1,499 AED includes colour with supporting services such as roots touch-up, toning, haircut, conditioning, blow-dry and styling, at a fixed price for any hair length. We plan the colour with you in a consultation, and give home-care guidance on swimming. We are one minute from Salah Al Din Metro Exit 1 in Deira; see our Deira salon page for directions, and book by WhatsApp or phone.
FAQ
Is chlorine bad for dyed hair?
Yes, it can be. Chlorine strips natural oils and makes the hair more porous, and colour-treated hair is already more open than untreated hair. The result is faster fading, dryness and breakage. A cap, fresh-water pre-wetting and a quick rinse afterwards reduce most of that.
Why does my blonde hair turn green after swimming?
The green comes mostly from copper in the pool water, for example from algaecides or old pipes. Chlorine makes the hair more porous, so copper sticks more easily, especially to bleached or highlighted hair. A chelating shampoo, used sparingly, is designed to remove it. If it does not shift, ask your stylist.
Can I swim with freshly coloured hair?
It is best not to. Fresh dye is more vulnerable to chlorine fading and structural damage, and UAB advises against colouring right before a swimming-heavy trip. Ask your stylist how long to wait for your particular colour and treatment, and plan your appointment around your swimming.
How do I protect coloured hair from chlorine?
Saturate your hair with fresh water, apply conditioner or a leave-in, and wear a snug swim cap with all hair tucked in. Afterwards, rinse immediately, wash with a sulfate-free shampoo including the scalp, and deep condition once a week.
How often should I use a chelating shampoo?
Only as needed, and no more than about once a month for regular swimmers according to UAB’s experts. It removes minerals such as copper, but it can be harsh on colour. For everyday washing, stay with a gentle sulfate-free shampoo.
Sources
- How To Protect Your Hair From Chlorine, Cleveland Clinic
- How to protect skin and hair from chlorine and salt water, UAB News
- Public Swimming Pools Safety Guidelines, Dubai Municipality
- Pseudo Green Hair, PMC
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