Continental Mfg Co Urinal Screens, Block,Non-Para, Floral Scent, 12/PK, Blue - Kleen Nonpara Screen Urinal Screens contain surfactants and chelating agents to clean and deodorize for 30 days (up to 2,000 flushes). Coloring agents are released with each flush so you know that it's working. Increased ventilation reduces potential splashback and flexible screen traps more debris to prevent costly drain clogs. 4 oz.