yes running the filter while swimming helps the filtration process. Also if the pool is saltwater then the system will replace chlorine being used while bathing.
Yes. Running the pool filter pump while swimming has no adverse effects to the swimmers.
not while swimming, for diving, helps you concentrate
sun screen
If you have a sand or DE filter the setting is filter in the case of cartridge filters it is filter as always unless there are other settings for your particular setup.
A tampon obviously
goggles or a diving mask should do fine.
While submerged in water? ie. Swimming outside Yes because while you are swimming you are still receiving some of the sun's rays, they should change.
If you get a cramp while swimming, stop and float on your back. Gently stretch and massage the affected muscle. Avoid making sudden movements and stay calm until the cramp subsides.
Yes, are you experiencing shortness of breath while swimming?
The clothing you would wear while swimming is the definition of swimming out.
No. Overdrive should be turned off when towing any trailer.