5 Colo. Code Regs. § 1003-5-4.7

Current through Register Vol. 47, No. 24, December 25, 2024

Section 5 CCR 1003-5-4.7 - CHEMICAL QUALITY

1. All public pools or semi-public pools shall be automatically and continuously disinfected by a chemical or process which imparts an easily measured residual which complies in all respects with the Standards of the National Sanitation Foundation (February 1, 1993) covering such chemicals or process.

2. Chemicals used for algae control shall be approved by the Colorado Department of Health.

3. Other disinfecting equipment or materials may be used if they have been adequately demonstrated to the Colorado Department of Health or its authorized agents to provide a satisfactory residual effect which is easily measured or where demonstration and analysis provide assurance that results are otherwise equally effective under conditions of use as the chlorine concentration required herein, and not be dangerous to public health, create objectionable physiological effects, or impart toxic properties to water.

4. Any pool shall be immediately closed under the following conditions:

A. Disinfection level falls below minimum requirement.

B. pH falls below minimum requirement, or exceeds maximum requirement.

5. Table 1 lists the chemical parameters required for any public pool or semi-public pool.

SECTION 4.7: TABLE 1

PARAMETER	REQUIRED PPM		IDEAL PPM
PARAMETER	Min.	Max.	Min.	Max.
Free Chlorine (pool) (DPD method) Free Chlorine (spa, therapy pool) (DPD) Combined Chlorine	0.25* 0.25*" 0.00	5.0 5.0 1.0	1.0 3.0 0.0	3.0 5.0 0.0
Bromine (pool) (DPD) Bromine (Spa, therapy pool) (DPD)	1.5 2.0	5.0 10.0	2.0 3.0	3.0 5.0
Total Alkalinity (CaCO3) Ph Calcium Hardness	70 7.2 150	180 8.0 600	**** 7.4 200	**** 7.6 400
Temperature (Incl. spas, therapy pools)	77	104	*****	*****
O.R.P. (in mv) (if applicable)*	250	900	650	850
Hydrogen Peroxide (if applicable)	20	100	30	40
Ion Generator (if applicable)** Copper Silver	0.25 15	0.95 50	0.3 25	0.5 40
Ozone (supplemental oxidizer only)	N/A	0.1	N/A	N/A
Saturation Index (Langlier Index)	-0.5	+05	-0.2	+0.2
Cyanuric Acid (ppm)	20	100	20	40

* O.R.P. at a pH of 7.5, and in accordance with Graph #1.

**In conjunction with a 0.4 ppm chlorine residual.

***0.25 ppm chlorine residual only when used with an approved supplemental oxidizer.

****Differences may occur according to pool finish, disinfectant, etc. Consult your pool manufacturers recommendations for ideal level.

*****Recommended general use swimming pool temperature range + 82-84 degrees F.

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5 CCR 1003-5-4.7

43 CR 22, November 25, 2020, effective 12/15/2020