worked on concrete
My backyard is almost entirely concrete and we have three dogs.  The urine odor can become really repulsive, especially on warm days.  I tried tons of different sprays but they don't last for more than a couple of hours.  I was surprised and pleased that these tiny granules (like a very course sand) were still helping to abate the odor a couple of days later.  I will be ordering more.
Rating: 5 stars