Every private swimming pool shall be enclosed with a good quality chain link wire, wooden-enclosed fence, exclusive of snow fence, or other equivalent fence with open spaces no more than three inches, of not less than four feet nor more than six feet in height, except for aboveground pool structures where said structure and/or structure with attached topping fence and gate, are at least four feet above the ground level and a removable ladder is attached only when the pool is occupied. Such fence shall have a self-closing locking-type gate, which is to be maintained in working order at all times and shall be located at least five feet from lot lines.