The Royal RY7910 Procision carpet extractor has two suction nozzles, not just one like other extractors.  That means dirty water never has a chance to soak into your carpet so you get a drier, cleaner carpet.  Plus, it has two revolving brushes that rotate in opposite directions so your carpet gets cleaned from all sides.

Switches in the handle turn the power, extraction chemical dispenser, and revolving brushes on and off with the touch of a finger.

Royal Procision has a separate extraction chemical dispenser that automatically measures the correct amount of extraction chemical and mixes it with clean water, so there's no more guessing about the right amount to use.

Because the extraction chemical is separate from the clean water, you can turn the extraction chemical  dispenser off to rinse the carpet you've just cleaned.  A clean water rinse removes sticky soap residue that can attract new dirt more quickly, and it's easy to do with the Procision.