Big D non-para deodorant block. These deodorant screens are impregnated with Big D deodorant. Available in clean breeze fragrance. They are flexible and will fit most urinal. Ideal for restroom, schools, hospitality, food service, property management, health care, industrial. The Non-Para, blue, urinal toss block cleans and deodorizes with every flush. The block is 100 percent biodegradable and entirely water soluble. Each block will last approximately 1500 flushes.