3.3 Pool Width and Lanes (SW Rule SW 1.2)

Competition pools for World Aquatics events must have a minimum of eight lanes. Lane specifications: Lane width: minimum 2.5 m (8 ft 2 in) per lane; Two spaces outside lanes 1 and 8: minimum 0.5 m (1 ft 8 in) each; Total minimum pool width for 8 lanes: 21 m (68 ft 11 in)

Send this to your friend — argument over.