675 IAC 20-1.1-20 Definitions "U"

Sec. 20. (a) "Underwater light" means a fixture designed to illuminate a pool from beneath the water surface, further defined as: (1) "dry niche light" means a light unit placed behind a watertight window in the pool wall; or (2) "wet niche light" means a watertight and water-cooled light unit placed in a submerged, wet niche in the pool wall and accessible only from the pool. (b) "Upper distribution system" means those devices designed to distribute the water entering a permanent medium filter in a manner so as to prevent movement or migration of the filter medium. This system shall also properly collect water during filter backwashing unless other means are provided. (c) "UV treatment" means an artificially generated ultraviolet light used as a sanitizer to supplement chemical treatment of the water. For the purpose of this document, it shall be UV-C or germicidal, wavelength of two hundred fifty-four (254) nanometers, producing minimum dosage of forty (40) mJ/cm2.