19. A swimming pool whose surface is greater than 150 m2 must be provided with control stations:(a) equipped with chairs at least 1.8 m above the surface of the water;
(b) the minimum number of stations to be:i. one control station if the surface water plan is 150 m2 to 350 m2;
ii. 2 control stations if the surface water plan is 351 m2 to 600 m2;
iii. 3 control stations if the surface water plan is 601 m2 to 900 m2;
iv. 4 control stations if the surface water plan is 901 m2 or more;
(c) situated near enough to the walls of the pool to allow unobstructed visibility of the bottom of the pool in the supervised zone as well as designed and installed so that the safety supervisor is not blinded by the sun; and
(d) for the exclusive use of safety supervisors.