To better understand why the permanent elimination of urine odor can be so time consuming and seem so frustrating, one must have a basic understanding of what urine is, how it behaves as it dries and what it is that is actually producing the odor our nose identifies as urine odor.
One must also realize what processes SCOE 10X needs to perform to eliminate the urine odor.
Animal urine (dog, cat, hog, horse, human, etc.) is the product of animal's kidneys and therefore every type of animal urine has roughly the same complex chemistry. Indeed, urine has a very complex chemistry that behaves like salt and glue as it dries.
As urine dries, the ureas in the urine form hard crystals or salts (much like table salt), while the fats, hormones and numerous other chemicals found in urine, coat and literally glue the urea crystals to whatever the urine comes in contact with. This coating action of the other chemicals act as an impermeable water barrier which inhibits re-hydration of the urea crystal.
Consequently, urine residue locks itself on and around any fiber (carpet especially) or material it comes in contact with, and by drying, forms an almost impenetratable water barrier which greatly complicates removal.
Synthetic carpet fiber is muti-lobed in profile and has numerous depressions which get filled with urine residue. Removing urine residue from these depressions present a significant challenge and why spraying carpet with SCOE 10X is not recommended spraying only treats half of the carpet fiber.
Urine itself has very little odor and does not, of itself, produce odor.
It is bacteria living in the environment, feeding on the urine residue, which produce a waste gas that our nose identifies as urine odor. (The bloating of a dead animal is the best example of this. As the bacteria inside the dead animal feed and produce gas, the dead animal bloats.)
Likewise, the same thing happens in your home. As bacteria feed on urine residue and produce gas, your home fills with urine odor.