An automatic detergent mixing system ensures that your carpets get *just* the right amount of detergent needed. Promising review: 'My previous carpet cleaner was a very expensive vacuum cleaner which worked great. When it finally died, I decided to go cheap and get this one instead; this carpet cleaner is so much better than my old one ever was. So happy I didn't get a more expensive one.' —rdgitGet it from Amazon for $129.99.