Boardwalk Urinal Screen W/Non-Para Cleaner Block, Green Apple, 12/Box - BWKNUSDeodorizes, cleans and prevents scale buildup. Water activated. Every flush tints the water blue, while healthy bacteria eliminate odors, fight bacteria growth and maintain drain lines. Screen traps debris. Lasts up to 1,500 flushes. Contains no parachlorides. Deodorizes, cleans and prevents scale buildup. Every flush tints the water blue, while healthful bacteria eliminate odors and maintain drain lines. Screen traps debris. Lasts up to 1,500