For serious issues, such as pet urine odors:
Locate the source of the odor. Noting the surface stain in generally sufficient however using a black light or moisture detection device can be useful. A good rule of thumb is that urine migrates laterally about 50% beyond the stain area, as well as penetrating deeply beneath the carpet surface.
Mix Odorcide 210 Concentrate with water at the rate of 1 to 16 (8oz. per gallon).
After testing for colorfastness, apply sufficient mix to cover the contaminated area and to penetrate as deeply as the odor source. For faster absorbtion, this process works best on dry surfaces. Pressure Spray at 40 to 100 PSI, Inject or Pour on. To assure penetration, use a roller or simply walk the product in. Excess product can be extracted once you are confident Odorcide has reached the odor source. If any odor remains, Odorcide did not reach the odor source.