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Unobstructed walk areas not less than 6 feet wide shall be provided to extend entirely around the pool. The walk area shall be constructed of impervious material and the surfaces shall be such as to be smooth and easily cleaned and of non-slip construction. The slope of the walks shall have a pitch of at least 1/4 inch (6 mm) to the foot (300 mm), designed so as to prevent back drainage from entering the pool. Walk drains shall be provided for each 100 square feet (9.29 m
2
) of walk area. Drain pipe lines shall be at least 3 inches (75 mm) in diameter, drain openings shall have an open air of at least four times the cross-sectional area of the drain pipe. The walk drain systems shall have an indirect connection to the sewer. The walk drains shall not be connected to the recirculation system piping. The drainage system shall be constructed of materials in conformance with Article 7 of this chapter, with the exception that all drainage and recirculation piping may be Schedule 40 PVC.