§ 69.1-5-12. Water Treatment and Test Equipment.

A.

No chemicals other than those specified in § 69.1-3-13(A) shall be used to treat spa pool water without written authorization from the Director.

B.

Except as noted below, disinfectant residual, pH, total alkalinity, and calcium hardness shall be continuously maintained within the minimum and maximum ranges specified in Table IV. If the spa pool is equipped with automatic chemical controllers utilizing ORP measurements, ORP shall be maintained within the ranges specified in Table IV. Disinfectant residual limits specified in Table IV may be exceeded in pools with automatic chemical controllers, which utilize ORP measurements and continually analyze and automatically control pH and the disinfectant residual, only if necessary to maintain the ORP specified in Table IV. However, the disinfectant residual shall not exceed ten ppm in such pools. The use of ORP sensing equipment does not eliminate the requirement for routine water testing specified in § 69.1-5-3. Disinfectant residual limits specified in Table IV may be exceeded when superchlorinating a spa pool provided that no patrons are present in the spa pool water and that the disinfectant level is returned to the acceptable range prior to allowing patrons to enter the spa pool water.

Table IV. Chemical Water Quality Standards for Spa Pools.

Parameter	Minimum	Ideal	Maximum
Free Chlorine Residual (ppm)	2	3 - 5	10
Combined Chlorine Residual (ppm)	0	0	0.2
Bromine Residual (ppm)	2	3 - 5	10
Oxidation Reduction Potential (ORP) (millivolts)	650	750 - 900	N/A
pH	7.2	7.4 - 7.6	7.8
Total Alkalinity (ppm)	60	80 - 120	180
Calcium Hardness (ppm)	150	200 - 400	1000

 

C.

If cyanuric acid or chlorinated cyanurates is used in an outdoor spa pool, the cyanuric acid levels and disinfectant residuals shall be maintained within the following ranges:

1.

A free chlorine residual of at least four ppm shall be maintained for cyanuric acid levels from zero to 50 ppm. The concentration of cyanuric acid shall not exceed 50 ppm. The use of cyanuric acid or other chlorine stabilizers is prohibited in indoor spa pools.

D.

An approved water quality test kit shall be provided as specified in § 69.1-3-13(E).

E.

Hand-feeding of chemicals shall not be permitted while the spa pool is open or accessible to patrons and within 30 minutes of opening. (28-01-69.1; 5-05-69.1.)