???well screen??? means perforated pipe or tubing, unsealed concrete tiles or other material installed in a well to filter out particulate matter and form the water intake zone. (???filtre de puits???) R.R.O. 1990, Reg. 903, s. 1; O. Reg. 128/03, s. 1; O. Reg. 372/07, s. 1 (1-8); O. Reg. 468/10, s. 1.