Just caught a story about the bacteria found in swimming pools, lakes, rivers, and oceans. In particular they mentioned that chlorine is not immediately effective against some bugs that can live as long as days in a pool. As a kid I had chronic ear infections and always from pools. I could swim in the ocean without any problems. They used to attribute this to water trapped in the ear, but now they [CDC] are saying that this results in part from the bacteria in pool water. In particular they warned against getting water in your mouth as this can cause a number of GI problems. One interesting note: At the age of fifteen I had surgery which resulted in ~500 stiches internally and externally. After something like 10 weeks, the wound seemingly healed more in one day at the beach than during the entire previous ten weeks. It seems that there is nothing like salt water and sun to heal a wound.