Why do swimsuits turn green and what to do about it?

Have you ever noticed that your swimsuit turns green after a day in the pool or at the beach? While it may be alarming, there is a simple explanation for this phenomenon and steps you can take to prevent or fix it.

The short answer

In short, swimsuits can turn green for a variety of reasons, including the presence of copper in pool water, algae in the water, and reactive chemicals in sunscreens and lotions. To prevent your swimsuits from turning green, rinse them with fresh water after each use, avoid wearing them in pools with high copper levels, and apply sunscreens and lotions after swimming. If your swimsuit has already turned green, there are several steps you can take to remove the discoloration. These include using a commercial swimsuit cleaner, a mixture of white vinegar and baking soda, a laundry detergent containing enzymes, or a bleach soak (for white swimsuits only).

Why do swimsuits turn green?

One of the main causes of green swimsuits is the presence of copper in the pool water. Copper is a commonly used algaecide and bactericide in swimming pools and is effective at keeping the water clean and clear. However, copper can also cause swimsuits to turn green when it reacts with the chlorine in the water. This reaction can lead to the formation of copper chloride, which can stain swimsuits green.

Another cause of green swimsuits is the presence of algae in the water. Algae can grow in pools, especially in warm, sunny weather, and can also cause swimsuits to turn green. Algae contain chlorophyll, which is what gives them their green color. When swimsuits come into contact with algae, they can absorb the chlorophyll and turn green as a result.

Reactive chemicals in sunscreens and lotions can also cause swimsuits to turn green. Some sunscreens and lotions contain ingredients that can react with the chlorine in the water, leading to the formation of green stains on swimsuits. To avoid this, it is best to apply sunscreens and lotions after swimming, or to use products that are labeled as “water-resistant” or “water-proof.”

So, what can you do to prevent your swimsuits from turning green? One of the simplest and most effective ways to prevent green swimsuits is to rinse them with fresh water after each use. This will help to remove any chlorine, copper, or algae that may be stuck to the fabric. You can also avoid wearing your swimsuit in pools with high copper levels, as these are more likely to cause discoloration. Finally, try to avoid applying lotions or sunscreens before swimming, as these can contribute to the problem.

What to do about a green swimsuit?

If your swimsuit has already turned green, don’t worry – there are steps you can take to remove the discoloration. One option is to use a commercial swimsuit cleaner, which is specifically formulated to remove chlorine, copper, and other contaminants from swimsuits. Alternatively, you can try using a mixture of white vinegar and baking soda to gently lift the stains from the fabric. Simply mix equal parts vinegar and baking soda to create a paste, apply the paste to the affected areas of the swimsuit, and let it sit for a few hours before rinsing it off.

Another option is to wash your swimsuit with a laundry detergent that contains enzymes. Enzymes are proteins that can break down and remove stains, and they are often included in laundry detergents as a way to boost their cleaning power. Simply follow the instructions on your laundry detergent and wash your swimsuit on a normal cycle.

If all else fails, you can try a bleach soak to remove the green discoloration from your swimsuit. However, keep in mind that this method should only be used on white swimsuits, as bleach can discolor or damage colored fabrics. To do a bleach soak, mix a solution of one part bleach and three parts water, and soak your swimsuit in the mixture for a few hours before rinsing it off and washing it as usual.

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Jonatan Rosdahl

I’ll write about anything and everything related to swimwear!