The pH level of a carpet is important because it affects the way a carpet cleans. The pH level of a carpet is measured on a scale from 1 to 14, with 7 being neutral. The lower the pH, the more acidic the carpet is. Carpets with low-level pH are difficult to clean because they have more dirt and oil in them than carpets with high levels.
A low-pH carpet is acidic, meaning that it has more dirt and oil in it than carpets with high levels. A low-pH carpet is difficult to clean because of this and should be cleaned by professionals who can use stronger chemicals to break down these substances.