(1) No piping arrangement shall exist under any conditions which will permit sewage or waste water to enter the recirculation system or water from the recirculation system or swimming pool or spa to enter the make-up water supply.

(2) No pipe furnishing water for the make-up supply shall be physically connected to the recirculation system regardless of valve arrangement.

(3) The make-up water line discharging directly to the swimming pool shall have its point of discharge at least 6 inches above the swimming pool overflow level.

(4) The make-up water line discharging to a surge or balancing tank shall have its point of discharge at least 6 inches above the rim of the tank.

(5) All other accessories to the recirculation system, such as chemical solution feeders and water-fed chlorinators shall be protected by air gap against back-siphonage into the water supply system.