The Big D® EXTRA DUTY URINAL SCREEN WITH NON-PARA BLOCK cleans and deodorizes with every flush while protecting the drain from debris. The block inside the screen lasts up to 1500 flushes. Blocks are acid-free, water-soluble and 100% biodegradable. Contains no paradichlorobenzene Lasts up to 1500 flushes Blocks are water-soluble and 100% biodegradable Acid-free Apple Fragrance
