FREE Shipping on all US Orders
The pool isn't making your hair fall out. But it might be making everything else worse.
Here's the good news: chlorine doesn't actually cause hair loss. A study of 67 professional swimmers confirmed it — despite visible damage to their hair, they didn't lose more hair than non-swimmers. Here's the part that still matters: chlorine strips natural oils, disrupts scalp pH, and worsens an already-irritated scalp. In the middle of summer, when sun, heat styling, and chlorine all hit at once, that combination compounds. Here is what to do about it.
Chlorine damage almost always shows up as breakage, not shedding from the root. Short, uneven strands around the hairline. Hair that snaps mid-shaft rather than falling whole. The good news is that breakage and follicle-origin hair loss are completely different problems — and breakage is much easier to prevent.
Every summer the same fear resurfaces: the pool is ruining your hair. You can smell the chlorine on your pillow. Your hair feels like straw by August. Something is definitely happening.
Here is what the research actually says. A study published in the Journal of Dermatology compared the hair of 67 professional swimmers — people in chlorinated pools for hours every day — to 54 people who spent little to no time in the pool. The swimmers' hair showed clear signs of chlorine damage: dryness, coarseness, discolouration. But they were not significantly more likely to experience hair loss than the non-swimmers.
So: chlorine doesn't cause hair loss. But it does cause real damage to the hair shaft and scalp environment — and in summer, when you're also dealing with sun exposure, heat styling, and potentially salt water too, the combination compounds in ways that are worth understanding and easy to prevent.
What Chlorine Actually Does
Breakage, not shedding — and why that matters.
When chlorinated water contacts hair, it lifts the cuticle — the outermost protective layer — and strips the natural oils that keep the shaft flexible and strong. The result is hair that becomes dry, porous, and brittle. When brittle hair breaks, it snaps mid-shaft rather than falling from the root. That's why you might see more hair in the brush after a summer of swimming — but it's breakage, not the follicle-origin loss that the rest of this series has been covering.
The tell: broken hairs are short, uneven, and don't have a white club root at the end. Hairs lost from the follicle are full-length with an intact root. If what you're seeing after pool sessions is predominantly shorter, irregular strands — that's chlorine breakage, and it's fixed at the strand level, not the follicle level.
The one exception worth knowing: if you already have a sensitive or inflamed scalp — seborrheic dermatitis, a compromised acid mantle, existing microbiome dysbiosis — chlorine exposure can make things worse, causing dryness, flaking, and irritation that may hinder optimal hair growth. The scalp that's already struggling doesn't need the extra alkaline, oil-stripping challenge that pool water provides.
The Pre-Swim Fix
One thing that makes a bigger difference than anything you do after.
The single most effective thing you can do for your hair before getting in a pool: saturate it completely with fresh water first. Dry hair absorbs chlorinated pool water readily — it's porous and pulls in whatever it contacts. Hair that's already fully saturated with fresh water has far less capacity to absorb chlorinated water. This takes thirty seconds at the poolside shower and makes a genuine difference to how much chemical your hair takes on.
Adding a leave-in conditioner or light oil over the wet hair before you swim creates an additional barrier. The oil you've been applying as part of the daily pre-shampoo ritual does the same thing — a light coating on the hair and scalp reduces direct chlorine contact at the scalp surface.
The Post-Swim Routine
Three steps, none complicated.
The longer chlorine stays on your hair and scalp, the more time it has to strip oils and irritate the surface. Rinse thoroughly with fresh water as soon as you're out of the pool — before it dries on your hair. This is the highest-return, lowest-effort step in any swim-care routine.
Pool water is alkaline — typically pH 7.2 to 7.8. Your scalp's healthy acid mantle sits at pH 4.5 to 5.5. After swimming, the scalp surface has been shifted toward alkaline, which is the same disruption that standard high-pH shampoos cause. A pH-balanced shampoo at 5.5 helps restore the acid mantle and limit the Malassezia overgrowth window that alkaline conditions create. This is the same argument for pH-balanced shampoo from the microbiome article — pool exposure makes it more relevant, not less.
Chlorine-exposed hair has an open cuticle and depleted moisture. A generous conditioner application — focused on the lengths, not the scalp — followed by a cool water rinse closes the cuticle and seals in the moisture the conditioner delivered. The cool rinse is the same principle from the shampoo protocol article: slightly cooler than body temperature closes the cuticle more effectively than warm water does.
The summer combination problem.
Chlorine alone isn't the worry. What's worth paying attention to in summer is the combination: chlorine strips oils and disrupts pH, then sun exposure adds oxidative stress and UV damage on top, then heat styling to manage frizzy post-swim hair adds thermal protein damage on top of that. Each one is manageable on its own. Together, in the same week, repeatedly through July and August, they compound.
The practical answer isn't avoiding the pool — it's the thirty-second pre-swim fresh water soak, the immediate post-swim rinse, the pH-balanced shampoo, and the SPF spray on your scalp when you're out of the water. Four small habits that address four different damage mechanisms before they stack up.
It will make a damaged scalp more damaged. There's a difference — and a fix.
pH-balanced formulation for the post-swim routine.
A shampoo formulated at 5.5 helps restore the acid mantle that pool water disrupts — making it especially relevant in summer when alkaline exposure is more frequent.
→ Explore the Shampoo Collection → Explore the Conditioner CollectionScience, ritual, and botanical intelligence — delivered daily.
Each morning, one article. New research, ancient wisdom, and the honest science of hair and scalp health. Written for women who want to understand what is happening — not just what to buy.
By subscribing you agree to receive email from Laritelle Organic. Unsubscribe at any time.