Boardwalk Urinal Para Deodorizer Block instantly eliminates unpleasant bathroom odors with a powerful scent. Freshens bathrooms up to a month with a cherry scent that masks the smell of urine. Each Paradichlorobenzene block is individually wrapped to seal in scent keep block fresh and prevent chipping. Para deodorizer lasts up to 30 days to keep smells at bay and ensures guests are comfortable.