Fresh Products Eco Fresh Non-Para Enzymatic Block And Screen, Green Apple, 12/Box - FRS12SANIFreshens 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. 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