For professional carpet cleaning results, as a minimum we recommend a pump with at least 100psi water pressure. Coupled with a professional vacuum system (to suck the water back out) you can achieve top class professional results with a 100psi pump. Pumps in the 100psi to 150psi range tend to be diaphragm pumps.

A psi setting of 500-100 psi will provide enough pressure to dislodge any particles that may have seeped inside the carpet fibers. Tough stains require a high psi setting, especially if the stain occurs on a light-coloured carpet.

Hot Water Extraction Otherwise known as steam cleaning, this is easily the most common professional carpet cleaning technique.