(a) No chemicals other than those specified in Section 838.63(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, calcium hardness, and total dissolved solids 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. The use of ORP sensing equipment does not eliminate the requirement for routine water testing specified in Section 838.87. 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 |
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 | 1,000 |
(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 fifty ppm. The concentration of cyanuric acid shall not exceed fifty 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 Section 838.63(e).
(e) Hand-feeding of chemicals shall not be permitted while the spa pool is open or accessible to patrons and within thirty minutes of opening.
(Ord. 07-14. Passed 12-18-07.)