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How to Keep Pool Water from Turning Your Extensions Brassy Chlorine is rough on extension color, and one long afternoon in the pool can leave your gorge...
Chlorine is rough on extension color, and one long afternoon in the pool can leave your gorgeous investment looking dull or oddly green at the ends. This is for anyone wearing extensions who still wants to actually enjoy summer without babying their hair. Here's how to protect the color so it lasts the season.
Extension hair reacts to chlorine differently than the hair growing out of your head. Your natural hair gets a steady supply of oil from your scalp, which gives it a little built-in protection. Extension hair doesn't. Once it leaves the head of the person who donated it, it's on its own, relying entirely on the products you put on it and the care you give it.
Chlorine is a bleaching agent. That's its whole job in a pool: killing bacteria and lifting stains. It doesn't know the difference between algae and your $600 set of hand-tied wefts. Over time, it strips the color and roughs up the cuticle, which is why extensions can start looking faded, dry, and straw-like after a summer of swimming. And if you've got lighter or blonde extensions, chlorine plus the copper that's sometimes in pool systems is what turns hair that greenish tint. It's not the chlorine alone that does it. It's the copper reacting with your hair, and chlorine helps that reaction along.
Salt water is gentler on color but harder on texture. It dries the hair out and makes tangling worse, especially at the nape. So neither one is a free pass, but the pool is where color takes the biggest hit.
This is the single most useful thing you can do, and almost nobody does it. Wet your extensions with clean tap water before you get in the pool. Hair is like a sponge. If it's already full of clean water, it can't soak up as much chlorinated water. Dry extensions will drink in whatever they touch first, and you want that to be regular water, not the stuff full of chemicals.
Take it one step further and work a little conditioner or a leave-in through the mid-lengths and ends before you swim. It creates a light barrier so the chlorine has to get through that first. You don't need anything fancy. A basic leave-in you already own is fine.
The color that fades fastest is the color that spends the most time submerged. So the easiest protection is just keeping your extensions out of the pool as much as you reasonably can.
A loose braid or a bun keeps most of your length dry and cuts down on tangling at the same time. If you're the type who actually swims laps and dunks under, a swim cap over your extensions isn't glamorous, but it works, and nobody at the pool is judging your hair choices as hard as you think. For everyday floating and hanging out, a bun clipped up high keeps the bulk of your hair above the waterline. Just don't yank it too tight at the roots if you're wearing tape-ins or bonds, since constant tension isn't great for how they sit.
Do not let pool water dry in your extensions. The longer chlorine sits, the more damage it does, and the more likely you are to see that brassy or green cast set in. Get to a shower or even a garden hose and rinse your hair with clean water as soon as you're out for the day.
A quick rinse pulls most of the chlorine out before it has time to react. Follow it with a gentle sulfate-free shampoo when you can, then a good conditioner or hair mask focused on the mid-lengths and ends. This is where extension hair needs the moisture most, since it can't refill itself the way your natural hair does. The CDC has helpful guidance on healthy swimming and pool water if you're curious about what's actually in the water you're rinsing out.
First, don't panic and reach for a blue or purple toning shampoo to fix green. Those cancel out yellow and brassy tones, not green. For a green tint from copper, you want a clarifying shampoo to lift the buildup, and there are color-correcting products made specifically for swimmer's green. A little goes a long way, so start light.
For general brassiness on blonde or light extensions, a purple shampoo used once a week can help hold the tone. Use it sparingly, though. Overusing purple shampoo can leave extensions looking muddy or dull, which is a different problem you'll then be trying to fix. And if the color has really shifted, this is a conversation for your stylist. Extension hair can't always be re-toned the way your own hair can, and pushing it too hard risks the texture. Better to ask before you experiment.
No routine keeps extension color perfectly frozen through a summer of swimming. Sun and pool water both lift color over time, and that's just the nature of hair that isn't being fed by your scalp. What these habits do is slow it way down, so your extensions look great for months instead of fading in a few weeks.
If you know you're going to be in the pool constantly all summer 2026, talk to your stylist about it up front. Some people choose a slightly cooler or deeper tone at the start of the season, knowing the sun will lighten it a little anyway. Others plan their color refresh appointment for the end of summer instead of the middle. Working with the season instead of fighting it is almost always the smarter move, and it keeps your extensions looking like the investment they are.