After many years of living in our dogs playground we had one room apprx 800 sq feet of urine. I mean we couldn't do anything about it. We would spray something or have a prof cleaning and still to no avail. Take a black light to our carpet and it would glow the entire room. I am so happy that j2 came this weekend. I took the black light out tonight and no. I mean NO glow. Thank you J2. You are awesome.