(Sometimes called 'doctor' or 'nibble' fish.)
You put your feet in to the water and they rush to nibble at all the nasty bits on your feet.
Excruciating at first, if, like me, you have very ticklish feet.
But after a while you get used to it and just let them feast!
After 15 or 30 mins you feet are baby soft.
Just massage them with some sweet smelling emollient and you are done.
("The Garra Rufa fish exfoliation is said to stimulate blood flow and improve circulation, remove bacteria and reduce foot odour and help prevent athlete's foot. Feet will be smoother and softer after treatment. It's also said the fish can stimulate acupuncture points, helping to regulate the nervous system, relax the body and release fatigue." - How can you not have a go!)
My treat to myself today after having my hair cut.
Well worth it.
Give it a try.