Rule 15-11-55-4.6.3 - Plumbing Fixtures1. Cross-connections shall not be permitted.2. A cross-connection shall be considered broken where a minimum air gap of at least twice the diameter of the water pipe is provided, where potable water enters the pool and where pool water or water from the recirculation system is discharged to a sewer system.3. Back flow shall not be permitted. A potable water distributing pipe shall be considered as protected against back flow from any plumbing fixture or other piece of equipment or from any appliance capable of affecting the quality of the water in the potable water supply where as air gap of at least twice the diameter of the water supply pipe has been provided. Where it is not practicable to provide such minimum air gap, the connection of the fixture, equipment or appliance shall be equipped with a back flow preventer assembly of a type and at a location provided by the Board.4. The Board may require that a back flow preventer assembly of an approved type be installed at any fixed potable water outlet to which a hose may be connected and used in contact with liquids and other substances.5. The Southern Plumbing Code shall be final authority. 15 Miss. Code. R. 11-55-4.6.3
Miss. Code Ann. § 75-74-9.