Fresh Products Parazyme Urinal Screen W/Block, 30 Days, White, Springtime Fragrance, Dozen - FRSPP123USPBSFPliable screen traps debris and protects drain. Enzymatic para block releases billions of beneficial bacteria that destroy odors at their source. Lasts up to 30 days. Pliable screen traps debris and protects drain. Enzymatic para block releases billions of beneficial bacteria that destroy odors at their source. Lasts up to 30 days. Deodorizer Type: Urinal Block Screen; Scent: Springtime; Color(s): White.