(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 a secondary disinfection system approved by the department, such as ultraviolet or other proven systems to control disease.

(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.

(4) The department may require a supplemental UV or ozone disinfection system on a pool, spa, or other water feature in a plan of corrective action when health and safety is threatened as indicated by repeated and documented violations.