Section 3134B — DISINFECTANT FEEDERS

2025 California Building Code (Title 24, Part 2) · 2025 edition · updated 2026-07-27 · California

Italicized text is a California amendment to the model code, as printed in the official publication.

Disinfectant feeders shall comply with applicable requirements established by the NSF/ANSI 50-2010 performance standard effective August 2010 for disinfectant feeders. In addition to the requirements for chemical feeders as indicated in Section 3133B, the following apply to disinfectant feeders.

3134B.1 Minimum capacity. ¶

All feeders shall be capable of supplying not less than the equivalent of 3 pounds (1 kg) of 100 percent available chlorine per day per 10,000 gallons (37,850 L) of pool water capacity.

3134B.2 Rate of flow adjustment. ¶

A visible means of determining the rate of flow through the device shall be provided for each disinfec- tant feeder.

3134B.3 Compressed chlorine gas disinfectant equipment. ¶

Chlorine gas shall not be dispensed directly into the water of a pool except as an aqueous solution through the return line of the recirculation system.

3134B.3.1 Compressed gas containers. Each container or cylinder shall be secured to prevent accidental movement. A valve protection cap shall be provided to cover the discharge valve at all times when the cylinder is not connected to the dispensing system.

3134B.3.2 Container scale. Compressed gas chlorine containers in use shall be on a scale in the gas chlorinator room.

3134B.3.3 Chlorine feeding device. The chlorine feeding device shall be capable of delivering chlorine in an aqueous solution at the maximum design rate. The device shall not allow the backflow of pool water into the chlorine container. The device shall not allow the release of chlorine gas to the atmosphere under normal operating conditions. The device shall be designed and installed to conduct chlorine gas leaks to the outdoors during a release of chlorine gas or an interruption of the water supply.

3134B.3.4 Piping. Piping carrying chlorine gas under pressure shall not be located outside the gas chlorination equipment room.

31B-14 2025 CALIFORNIA BUILDING CODE

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

PUBLIC POOLS

FIGURE 31B-1-DEPTHS AND CLEARANCES FOR POOLS WITH DIVING BOARDS GREATER THAN 30 INCHES (762 mm) ABOVE THE WATER

TABLE 31B-1

	*DEPTH OF WATER*	*DEPTH OF WATER*	*DEPTH OF WATER*	*DEPTH OF WATER*	*DEPTH OF WATER*	*LENGTH OF SECTION*	*LENGTH OF SECTION*	*LENGTH OF SECTION*	*LENGTH OF SECTION*	*LENGTH OF SECTION*
*BOARDS AND* *PLATFORMS*	*DIM*	D1	D2	D3	D4	L1	L2	L3	W1	W2
1-meter board	Min.	5'-6"	11'-6"	11'-2"	0'-0"	16'-5"	29'-7"	5'-11"	7'-11"	8'-3"
3-meter board	Min.	6'-6"	12'-6"	12'-2"	0'-0"	19'-9"	33'-8"	5'-11"	8'-7"	11'-6"

TABLE 31B-1

Notes for Figure 31B-1 and Table 31B-1: 1. Maximum radius shall equal D2 minus D1 dimensions. 2. Radius at the shallow end shall not be more than 12 inches. 3. The length of a section is based on the maximum slope and other maximum and minimum dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. The springline depth at (4) shall not be more than 4'-0". 6. The maximum water depth shall be 3'-6". 7. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.	Notes for Figure 31B-1 and Table 31B-1: 1. Maximum radius shall equal D2 minus D1 dimensions. 2. Radius at the shallow end shall not be more than 12 inches. 3. The length of a section is based on the maximum slope and other maximum and minimum dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. The springline depth at (4) shall not be more than 4'-0". 6. The maximum water depth shall be 3'-6". 7. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.	Notes for Figure 31B-1 and Table 31B-1: 1. Maximum radius shall equal D2 minus D1 dimensions. 2. Radius at the shallow end shall not be more than 12 inches. 3. The length of a section is based on the maximum slope and other maximum and minimum dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. The springline depth at (4) shall not be more than 4'-0". 6. The maximum water depth shall be 3'-6". 7. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.	Notes for Figure 31B-1 and Table 31B-1: 1. Maximum radius shall equal D2 minus D1 dimensions. 2. Radius at the shallow end shall not be more than 12 inches. 3. The length of a section is based on the maximum slope and other maximum and minimum dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. The springline depth at (4) shall not be more than 4'-0". 6. The maximum water depth shall be 3'-6". 7. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.	Notes for Figure 31B-1 and Table 31B-1: 1. Maximum radius shall equal D2 minus D1 dimensions. 2. Radius at the shallow end shall not be more than 12 inches. 3. The length of a section is based on the maximum slope and other maximum and minimum dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. The springline depth at (4) shall not be more than 4'-0". 6. The maximum water depth shall be 3'-6". 7. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.	Notes for Figure 31B-1 and Table 31B-1: 1. Maximum radius shall equal D2 minus D1 dimensions. 2. Radius at the shallow end shall not be more than 12 inches. 3. The length of a section is based on the maximum slope and other maximum and minimum dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. The springline depth at (4) shall not be more than 4'-0". 6. The maximum water depth shall be 3'-6". 7. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.	Notes for Figure 31B-1 and Table 31B-1: 1. Maximum radius shall equal D2 minus D1 dimensions. 2. Radius at the shallow end shall not be more than 12 inches. 3. The length of a section is based on the maximum slope and other maximum and minimum dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. The springline depth at (4) shall not be more than 4'-0". 6. The maximum water depth shall be 3'-6". 7. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.	Notes for Figure 31B-1 and Table 31B-1: 1. Maximum radius shall equal D2 minus D1 dimensions. 2. Radius at the shallow end shall not be more than 12 inches. 3. The length of a section is based on the maximum slope and other maximum and minimum dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. The springline depth at (4) shall not be more than 4'-0". 6. The maximum water depth shall be 3'-6". 7. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.	Notes for Figure 31B-1 and Table 31B-1: 1. Maximum radius shall equal D2 minus D1 dimensions. 2. Radius at the shallow end shall not be more than 12 inches. 3. The length of a section is based on the maximum slope and other maximum and minimum dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. The springline depth at (4) shall not be more than 4'-0". 6. The maximum water depth shall be 3'-6".

TABLE 31B-1 7. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.|Notes for Figure 31B-1 and Table 31B-1:
1. Maximum radius shall equal D2 minus D1 dimensions.
2. Radius at the shallow end shall not be more than 12 inches.
3. The length of a section is based on the maximum slope and other maximum and minimum dimensions.
4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6".
5. The springline depth at (4) shall not be more than 4'-0".
6. The maximum water depth shall be 3'-6".
7. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.|Notes for Figure 31B-1 and Table 31B-1:
1. Maximum radius shall equal D2 minus D1 dimensions.
2. Radius at the shallow end shall not be more than 12 inches.
3. The length of a section is based on the maximum slope and other maximum and minimum dimensions.
4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6".
5. The springline depth at (4) shall not be more than 4'-0".
6. The maximum water depth shall be 3'-6".
7. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.|

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

PUBLIC POOLS

FIGURE 31B-2-DEPTHS AND CLEARANCES FOR POOLS WITH DIVING BOARDS 30 INCHES (762 MM) OR LESS ABOVE THE WATER LINE

TABLE 31B-2

	*DEPTH OF WATER*	*DEPTH OF WATER*	*DEPTH OF WATER*	*DEPTH OF WATER*	*LENGTH OF SECTION*	*LENGTH OF SECTION*	*LENGTH OF SECTION*	*LENGTH OF SECTION*	*LENGTH OF SECTION*	*LENGTH OF SECTION*
*DIMENSION*	D1	D2	D3	D4	L1	L2	L3		W1	W2
Minimum	2'-6"	8'-6"	0'-0"	7'-0"	6'-0"	6'-0"	2'-6"	30'-0"	9'-0"	3'-0"
Maximum	—	—	3'-6"	—	10'-0"	—	4'-0"	—	—	—

TABLE 31B-2

Notes for Figure 31B-2 and Table 31B-2: 1. Radius at the shallow end shall be a maximum of 1'-0". 2. Springline D1 shall extend to the break in slope between the shallow area and the deep area. 3. Maximum radius shall equal D2 minus D1 dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. Length of section is based on maximum slope and other maximum or minimum dimensions. 6. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.	Notes for Figure 31B-2 and Table 31B-2: 1. Radius at the shallow end shall be a maximum of 1'-0". 2. Springline D1 shall extend to the break in slope between the shallow area and the deep area. 3. Maximum radius shall equal D2 minus D1 dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. Length of section is based on maximum slope and other maximum or minimum dimensions. 6. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.	Notes for Figure 31B-2 and Table 31B-2: 1. Radius at the shallow end shall be a maximum of 1'-0". 2. Springline D1 shall extend to the break in slope between the shallow area and the deep area. 3. Maximum radius shall equal D2 minus D1 dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. Length of section is based on maximum slope and other maximum or minimum dimensions. 6. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.	Notes for Figure 31B-2 and Table 31B-2: 1. Radius at the shallow end shall be a maximum of 1'-0". 2. Springline D1 shall extend to the break in slope between the shallow area and the deep area. 3. Maximum radius shall equal D2 minus D1 dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. Length of section is based on maximum slope and other maximum or minimum dimensions. 6. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.	Notes for Figure 31B-2 and Table 31B-2: 1. Radius at the shallow end shall be a maximum of 1'-0". 2. Springline D1 shall extend to the break in slope between the shallow area and the deep area. 3. Maximum radius shall equal D2 minus D1 dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. Length of section is based on maximum slope and other maximum or minimum dimensions. 6. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.	Notes for Figure 31B-2 and Table 31B-2: 1. Radius at the shallow end shall be a maximum of 1'-0". 2. Springline D1 shall extend to the break in slope between the shallow area and the deep area. 3. Maximum radius shall equal D2 minus D1 dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. Length of section is based on maximum slope and other maximum or minimum dimensions. 6. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.	Notes for Figure 31B-2 and Table 31B-2: 1. Radius at the shallow end shall be a maximum of 1'-0". 2. Springline D1 shall extend to the break in slope between the shallow area and the deep area. 3. Maximum radius shall equal D2 minus D1 dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. Length of section is based on maximum slope and other maximum or minimum dimensions. 6. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.	Notes for Figure 31B-2 and Table 31B-2: 1. Radius at the shallow end shall be a maximum of 1'-0". 2. Springline D1 shall extend to the break in slope between the shallow area and the deep area. 3. Maximum radius shall equal D2 minus D1 dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. Length of section is based on maximum slope and other maximum or minimum dimensions. 6. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.	Notes for Figure 31B-2 and Table 31B-2: 1. Radius at the shallow end shall be a maximum of 1'-0". 2. Springline D1 shall extend to the break in slope between the shallow area and the deep area. 3. Maximum radius shall equal D2 minus D1 dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. Length of section is based on maximum slope and other maximum or minimum dimensions. 6. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.	Notes for Figure 31B-2 and Table 31B-2: 1. Radius at the shallow end shall be a maximum of 1'-0". 2. Springline D1 shall extend to the break in slope between the shallow area and the deep area.

TABLE 31B-2 3. Maximum radius shall equal D2 minus D1 dimensions.
4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6".
5. Length of section is based on maximum slope and other maximum or minimum dimensions.
6. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.|Notes for Figure 31B-2 and Table 31B-2:
1. Radius at the shallow end shall be a maximum of 1'-0".
2. Springline D1 shall extend to the break in slope between the shallow area and the deep area.
3. Maximum radius shall equal D2 minus D1 dimensions.
4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6".
5. Length of section is based on maximum slope and other maximum or minimum dimensions.
6. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.|

31B-16 2025 CALIFORNIA BUILDING CODE

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

PUBLIC POOLS

FIGURE 31B-3-DEPTHS AND CLEARANCES FOR POOLS WITHOUT DIVING BOARDS

TABLE 31B-3A-POOLS WITH MAXIMUM WATER DEPTH ≤ 6'0"

	*DEPTH OF WATER*	*DEPTH OF WATER*	*DEPTH OF WATER*	*LENGTH OF SECTION*	*LENGTH OF SECTION*	*LENGTH OF SECTION*	*LENGTH OF SECTION*
*DIMENSION*	D1	D2	D3	L1	L2	L3	W1
Minimum	2'-6"	—	0'-0"	3'-6"	3'-0"	3'-0"	6'-0"
Maximum	—	6'-0"	3'-6"	—	—	—	—

TABLE 31B-3B-POOLS WITH MAXIMUM WATER DEPTH > 6'0"

	*DEPTH OF WATER*	*DEPTH OF WATER*	*DEPTH OF WATER*	*LENGTH OF SECTION*	*LENGTH OF SECTION*	*LENGTH OF SECTION*
*DIMENSION*	D1	D2	D3	L1	L2	W1
Minimum	2'-6"	> 6'-0"	0'-0"	3'-6"	3'-0"	7'-6"
Maximum	—	—	3'-6"	—	—	—
Notes for Figure 31B-3 and Tables 31B-3a and 31B-3b. 1. Radius at the shallow end shall be a maximum of 1'-0". 2. Springline D1 shall extend to the break in slope between the shallow area and deep area. 3. Maximum radius shall equal D2 minus D1 dimensions. 4. Where there is a break in slope, the break shall be located at a water depth equal to 4'-6". 5. Each pool shall be provided with a main drain submerged suction outlet typically located at the bottom of the pool that conducts water to a recirculating pump.

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

PUBLIC POOLS

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2025 California Building Code (Title 24, Part 2)