Float therapy

What is float therapy? What does floating actually feel like? Can I float if I'm claustrophobic? I can't swim — could I drown in a float tank? How much salt is in a float tank? How long is a float session? Can I listen to music while I float? How is the water in the float tanks kept clean? Is there a size or weight limit for floating? How much does a float session cost? How often should I float? What happens if I fall asleep while floating? Can I float on my period? Can I wear contact lenses while floating? What is the difference between the pod and the cabin?