Pet odors can linger for months if not treated properly. As urine dries in the carpet and padding, what’s left are millions of concentrated urine crystals that become even more pungent. Many companies just mask this odor. Chem-Dry uses a patented system, P.U.R.T. (Pet Urine Removal Treatment), to explode the urine crystals and break down the enzymes which gets rid of the pet urine odor forever.