Freshens and cleans the urinal for up to 1,500 flushes. Deodorizes, cleans and prevents scale buildup. Enzymes continuously eliminate odors and maintain drain lines; flexible screen traps debris. Tints water blue with every flush. Deodorizer Type: Urinal Block Screen; Scent: Green Apple. ~ Includes twelve 2.8 oz block and screen units.FRS12SANI. 12SANI. Fresh Products Sani Screen with Cleaner Block.