The fastest time wins. Competition distances range from 50 - 1,500m and there are four swimming styles, including backstroke, breaststroke, butterfly and freestyle. Medley events require athletes to swim all four swimming strokes in one race. Four athletes can also join forces in the freestyle and medley relay events.
British swimming stars confirmed to compete as part of a 43-strong squad include Olympic and World Champion Adam Peaty alongside Commonwealth Games medallists Hannah Miley, Ross Murdoch and Duncan Scott.