There is a reason why one must shower and put on a swimsuit prior to swimming.
Much like why showers are an important part of your PRE-Swim routine, by wearing a swim suit, you reduce the risk ofcontaminating the pool with waterborne illness and contaminants. Cotton and some other materials can hold detergents, germs, and bacteria in them, which can be released into the water. This can cause swimmers to get sick and even affect the water chemistry and clarity.
Cotton also tends to absorb a lot of water and pool chemicals, requiring the pool to use more disinfectant. Additionally, when the cotton absorbs the pool water, it can become pretty heavy, which can weigh down swimmers and make swimming more difficult. Cotton T-shirts also tend not to fit tight to the body, which can increase your risk of underwater entrapment.
Finally, cotton breaks down in the water, which clogs the pool filter system. Certain dyed material can also release some of the dye into the pool water, causing poor water clarity and water balance.
But once city, Commerce City, Colorado , is promising to revise its swimsuit rules after a Muslim woman was turned away from its recreation center pool for wearing an Islamic dress over a shirt and pants.
Saba Ali said that she offered to just wear the shirt and pants to swim on Sunday but was denied.
Commerce City spokeswoman Michelle Halsted says street clothes aren't allowed in the pool because they can increase the likelihood of contamination and waterborne illness. However they are looking into making exceptions for Muslim women.