A private swimming or wading pool; provided, however, that the inside wall of same shall not be erected, installed or maintained nearer than 15 feet to any side or rear property line or structure, and that the deck, equipment and any other structures associated with the pool shall be no nearer than six feet to any side or rear property line. Such a swimming or wading pool shall only be located in the rear yard, or in the case of a corner lot, it shall be no closer to any street line than two times the required front yard setback for the principal buildings. Such a swimming or wading pool shall not occupy more than 25% of the rear yard area, or in the case of corner lots, it shall not occupy more than 5% of the total lot area.