When puppy urinates on potty,urine passes through grate and absorbed to wee pad laid inside NugiPlus. Simply sprinkle water on wee pad with showerhead for 10 secs and puppy’s urine is completely washed away. As puppy relies on his sense of smell with a behavior to pees on the same place he does before, remaining small amount of scent of urine in wee pad attract puppy next time when puppy wants to relive himself. So it could be fastest, yet cost-efficient way to housebreaking your puppy.