Going to the pool when u have your period

My sister and I were having a conversation on it and she expressed how she thinks it is very much unsanitary of females who wear pads to the pool. 
I have a couple of questions and would like to read your thoughts and opinions as well as what you ladies do... 
When you go to the pool, do you wear a pad or tampon? 
For those who don't wear pads, why not? 
For those who do neither, what do you do? Just not go in the pool? 

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