ANSWER: Cleaning your carpets too quickly or slowly may not optimize cleaning performance. The BISSELL ProHeat Pro-Tech(TM), features a PerfectPass(TM) indicator which takes the guess work out of the cleaning process. The right speed will achieve better cleaning results.When you are using the PerfectPass (TM) at the "Best Cleaning" speed, you will be cleaning about 20 inches of your carpet each second.For more information, please contact a BISSELL Consumer Services Representative by calling 1800 811 183 or australiacustomerservice@bissell.com.