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No piping arrangements shall exist which under any conditions will permit sewage or waste water to enter the recirculation system, or water from the recirculation system or pool to enter the make-up water supply. This requirement shall be deemed to have been satisfied when the following conditions are met:
1. No pipe furnishing water for the make-up water supply is physically connected to the recirculation system regardless of valve arrangements, unless an approved vacuum breaker is properly installed on the make-up water line.
2. The make-up water line discharging directly to the pool has its point of discharge at least 6 inches (152 mm) above the walk area adjacent to the pool.
3. The make-up water line discharging to a surge or balancing tank has its point of discharge at least 6 inches (152 mm) above the rim of the tank.
4. The main drain line, and the filters' backwash and filter-to-waste lines have a free-fall discharge to the sewer or drain at such elevation that a surcharged sewer or drain could not force contamination back into the pool or recirculation system.
5. All other accessories to the recirculation system such as chemical solution feeders, water-fed chlorinators, etc., are protected against back siphonage into the water supply.