(1) In instances in which a pool, spa, or other water feature has more than two users contract waterborne disease such as cryptosporidium or giardia within a period of 30 days the department may require licensee of a pool, spa, or other water feature to develop a corrective action plan and submit to the department for approval.

(2) If the corrective action fails to bring the disease outbreak under control, the department will require that the facility install and utilize an ultraviolet disinfectant system as a secondary disinfectant system or other type of additional disinfection approved by the department that has been proven to control disease outbreaks as a secondary disinfectant system.

(3) Any licensee operating a splash deck or related water feature is required to install a secondary ultraviolet disinfection system approved by NSF and installed according to the manufacturer's directions into the main water line of the filtration system.