Current through Vol. 42, No. 1, September 16, 2024
(a)
Chlorinator or other disinfection feeder. The pool shall be
equipped with a chlorinator or other residual disinfectant feeder which meets
the following requirements:
(1)
Feeders. All chemicals and chemical solutions shall be added to
the pool water recirculation flow using a feeder that is acceptable to the
Department.
(2)
Construction
and materials. It 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. Feeders requiring field
maintenance or cleaning are required to be easily disassembled. The design and
construction shall be such as to preclude stoppage from chemicals used or
foreign material. The feeder shall incorporate failure-proof features so that
the disinfectant cannot feed directly into the pool, the pool piping or pool
enclosure following any type of failure of the equipment or its maintenance.
Super-chlorination shall be accomplished by the addition of calcium
hypochlorite, sodium hypochlorite, or other approved chlorine compounds.
Solution chemical feeders and flow through chemical feeders need to be listed
as meeting the appropriate National Sanitation Foundation Standard and bear the
NSF seal of approval.
(3)
Sizing of disinfection equipment. Solution and gas feeders shall
be capable of supplying the equivalent of 1.5 pounds of available chlorine in
eight (8) hours, for each ten thousand (10,000) gallons of pool capacity.
Feeders used with organic chlorine compounds or other stabilized chlorine shall
be capable of supplying the equivalent of 0.5 pounds of available chlorine in
eight (8) hours, for each ten thousand (10,000) gallons of pool capacity and
the cyanurate concentration in the pool shall be at least thirty (30) mg/1 and
does not exceed one hundred (100) mg/1.
(4)
Erosion type feeders.
Erosion type chlorinators using stabilized chlorine compounds shall have a flow
meter, calibrated valve, or other device acceptable to the regulatory authority
to determine the rate of flow of water through the chlorinator. The device can
be either calibrated in pounds chlorine feed per unit of time or calibrated in
gallons of flow per unit of time with an attached chart to convert the water
flow rate to pounds of chlorine feed. The feeder shall be capable of continuous
delivery within ten (10) percent of the dosage setting.
(5)
Solution type feed pumps.
The pump shall have a calibrated rate control and be adjustable from zero (0)
to full range. The feeder shall have the capability of feeding the required
dosage using a two and one-half (2-1/2) percent solution.
(6)
Chlorination for normal
operation. Chlorinators shall be installed per the manufacturer's
recommendation. Where super-chlorination is accomplished by chemical feeders,
the solution shall be introduced before the sand filter. When the disinfectant
is introduced at the suction side of the pump, a device or method shall be
provided to prevent air-locking of the pump or recirculation system.
(7)
Chlorination to prevent
backflow. The chlorinators shall be designed to prevent the backflow of
water into the chlorine container.
(8)
Compressed chlorine gas.
When compressed chlorine gas is used, the following additional features are
required:
(A) The chlorine and chlorinating
equipment are located either out-of-doors or in a separate well-ventilated
room. Such rooms should preferably be above ground and provided with vents near
the floor which terminate outdoors. The door of the room shall have a viewport,
not open to the pool enclosure, and open outward. When located out-of-doors,
the cylinders shall be securely anchored to prevent them from falling over and
surrounded by a six (6) foot high, woven wire fence, or equivalent, and a
locked gate.
(B) Where gaseous
chlorine equipment is provided below grade in a filter room, or in any part of
a building which provides housing, the mechanical proportioning device and
cylinders of chlorine shall be housed in a reasonably gas-tight,
corrosion-resistant, and mechanically vented enclosure. Air-tight duct work
from the bottom of the enclosure to atmosphere in an unrestricted area and a
motor-driven exhaust fan capable of producing at least one (1) air change per
minute is required. Automatic louvers of good design near the top of the
enclosure for admitting fresh air are required. An opening at least eighteen
(18) inches square, glazed with clear glass, and artificial illumination shall
be provided in an amount such that the essential performance of the equipment
may be observed at all times without opening the enclosure. The floor area of
the enclosure shall be of adequate size to house the chlorinator, fan, scales,
and one (1) extra chlorine cylinder.
(C) Electrical switches for the control of
artificial lighting and ventilation shall be on the outside of the enclosure
adjacent to the door.
(D) The
chlorine equipment shall be of rugged design capable of withstanding wear
without developing leaks.
(E)
Chlorine cylinders shall beon platform scales and anchored to prevent their
falling over. An approved and accessible chlorine cylinder valve stem wrench is
required.
(F) The chlorine feeding
device shall be designed so that during accidents or interruptions of the water
or electric power supply, the chlorine feed will shut off automatically and
leaking chlorine gas will be vented outdoors. The device shall be capable of
delivering chlorine at its maximum rate without releasing chlorine gas to the
atmosphere.
(G) A gas mask and
fresh replacement canister designed for use in a chlorine atmosphere and of a
type approved by the U.S. Bureau of Mines is required.
(H) The gas mask and canister shall be kept
in a closed cabinet accessible without a key and located well away from the gas
chlorinator or the room where the gas chlorinator is installed, such that it
may easily and safely be reached and be put on out of range of possible gas
fumes.
(I) Canister-type gas masks
are suitable only with low concentrations of chlorine gas. In the event of a
serious leak, the fire department shall be called.
(b)
Brominators or
other disinfectant devices. Where brominators or other disinfectant
devices are proposed, the design with respect to equipment, maintenance, and
safety shall be in accordance with the applicable provisions of
310:315-7-16.
(c)
Prohibitions and exceptions. Hand feeding. Hand feeding of
disinfectants to maintain normal disinfectant residuals is not acceptable;
however, the addition of chlorine solution by hand may be used periodically to
super-chlorinate for algal control. Super-chlorination shall be accomplished at
times when the pool is closed and a safe range of chlorine disinfection shall
be attained before patrons are permitted to return to the pool.
(d)
Electrolytic chlorine
generators. The electrolytic chlorine generator shall be of sturdy
construction and of materials which will withstand continual usage typical of
public pools and the feed rate shall be adjustable from zero (0) to full range.
The generator shall be capable of feeding a chlorine dosage of one and one-half
(1-1/2) pounds of available chlorine in eight (8) hours for each ten thousand
(10,000) gallons of pool capacity. The generator unit shall be UL approved or
NSF listed, and a failure-proof electrical interlock with the recirculation
pump shall be incorporated into the system such that the generator operates
only during recirculation pump operation. The generator units shall be
installed according to the manufacturer's instructions and the saline content
of the pool water shall be maintained in the required range specified by the
manufacturer. Ventilation and housing shall meet the requirements of
310:315-7-16 for compressed chlorine gas.
(e)
Feeders for pH adjustment.
Feeders for pH adjustment shall be provided on all pools using gaseous chlorine
for disinfection. They shall be adjustable from zero (0) to full range, and
shall meet the requirements of 310:315-7-16. When soda ash is used for pH
adjustment, the maximum concentration of soda ash solution to be fed shall not
exceed one-half (1/2) pound soda ash per gallon of water. Feeders for soda ash
shall be capable of feeding a minimum of three (3) gallons of the above soda
ash solution per pound of gas chlorination capacity. The minimum size of the
solution reservoir(s) shall not be less than fifty (50) percent of the maximum
daily capacity of the feeder. The solution reservoir(s) shall be marked to
indicate contents.
