(1) Where carbon dioxide is used at a pool, spa, or other water feature to adjust pH, the following requirements must be met:

(a) carbon dioxide cannot be stored below grade level;

(b) carbon dioxide must be stored in well ventilated rooms to prevent the accumulation of a high concentration of carbon dioxide that could reduce the oxygen level in the air to less than 19.5 percent;

(c) carbon dioxide must be used according to the safety requirements in the material safety data sheets provided by the supplier for carbon dioxide, including providing and using all recommended safety equipment;

(d) carbon dioxide tanks must be thoroughly secured to prevent any tipping or rolling cylinders;

(e) only authorized personnel who have been trained with the material safety data sheets provided by the manufacturer may have access to the carbon dioxide storage rooms; and

(f) only personnel trained in the handling of carbon dioxide shall be allowed to adjust or replace carbon dioxide tanks.