It will not impact other swimmers as LS is not contagious. I've enjoyed swimming with no issues. Every one can respond differently. It is great exercise and good for overall body health. I agree with changing shortly after swimming and applying whatever you use after cleaning and drying. Putting extra layers of ointment on to go swimming seems unnecessary as it will just rinse away. Enjoy your swim and take care of yourself afterwards. It's simple. Don't try to make it complex. I personally use Lisepten salve and apply it in a reasonable time after cleaning up. Don't stress over it, after all, stress contributes to symptoms. Just develop a healthy routine. Swimming is a part of staying healthy.