A. Requirements: The swimming pool shall be equipped with a chlorinator, hypochlorinator or other disinfectant feeder or feeders which meet the following requirements:
1. Shall be of sturdy construction and materials which will withstand wear, corrosion or attack by disinfectant solutions or vapors and which are not adversely affected by repeated regular adjustments or other conditions anticipated in the use of the device. The feeder shall be capable of being easily disassembled for cleaning and maintenance. The design and construction shall be such as to preclude stoppage from chemicals intended to be used or foreign materials that may be contained therein. The feeder shall incorporate failure proof features so that the disinfectant cannot feed directly into the swimming pool, the pool piping system, water supply system or the swimming pool enclosure under any type of failure of the equipment or its maintenance.
2. Shall be capable of supplying at least the equivalent of one pound of chlorine per eight (8) hours for each ten thousand (10,000) gallons of swimming pool capacity under conditions of operation to be anticipated at the proposed installation. This requirement may be reduced for special purpose swimming pools.
3. Shall have a graduated and clearly marked dosage adjustment to provide flows from full capacity of twenty five percent (25%) of such capacity. The device shall be capable of continuous delivery to within ten percent (10%) of the dosage at any setting.
4. When the disinfectant is introduced at the section side of the pump, a device or method shall be provided to prevent air lock of the pump or recirculation system.
B. Chlorine Gas: When compressed chlorine gas is used, the following additional features shall be provided:
1. The chlorine and chlorinating equipment shall be in a separate well-ventilated room. Such room shall not be below ground level and shall be provided with vents near the floor which terminate out-of-doors. The door of the room shall not open to the outside.
2. The chlorinator equipment shall be of rugged design, capable of withstanding wear without developing leaks.
3. Chlorine cylinders shall be anchored to prevent their falling over. A valve stem wrench shall be maintained on the chlorine cylinder so the supply can be shut off quickly in the case of an emergency. Valve protection hood shall be kept in place except when the cylinder is connected.
4. The chlorine feeding device shall be designed so that during accidents or interruptions of the water supply, leaking chlorine gas will be conducted to the out-of-doors.
5. The chlorine shall be a solution feed type, capable of delivering chlorine at its maximum rate without releasing chlorine gas to the atmosphere. (Injector water shall be furnished from the pool recirculation system with necessary pressure increase supplied by a booster pump.)
6. The chlorinators shall be designed to prevent the backflow of water into the chlorine solution container.
7. A gas mask designed for use in a chlorine atmosphere and of a type approved by the U.S. Bureau of Mines shall be provided. In addition, replacement canisters shall be provided and a record shall be kept of gas mask usage to ensure that the mask will be serviceable when needed.
8. The gas mask shall be kept in a closed cabinet, accessible without a key, located outside of the room in which the chlorinator is maintained.
9. Installation of chlorinator equipment, and operation thereof, shall be carried on by and under the supervision of personnel experienced with installation and operation of such equipment.
C. Hypochlorite Solution: When a hypochlorite solution is used to be fed through hypochlorinator equipment, such equipment shall also provide the following additional features:
1. Feed shall be positive under all conditions of pressure in the circulating system, and without artificial constriction of the pump suction line whether this line is under vacuum or pressure head.
2. Regulation shall be provided to ensure constant feed with varying supply or back pressure.
3. Positive features to prevent backflow from recirculation system to the solution container, and provision for reducing to a minimum the entry into swimming pool of free calcium released from calcium hypochlorite.
4. Provision to prevent siphoning of hypochlorite solution when the recirculation pump and hypochlorinator are both turned off. (This applies to above swimming pool level installations only.)
D. Equipment Design And Material: Equipment and piping used to apply chemicals to the water shall be of such size, design, and material that they may be cleaned and will be free from clogging, preferably of the positive displacement type. All material used for such equipment and piping shall be resistant to action of chemicals to be used therein. (Ord. 11-2-3-71, 5-6-1971)