Rug Doctor Mighty Pro Carpet Cleaning Machine The Mighty Pro has a 2.6 gallon solution tank and 3.1 gallon recovery tank for less refilling and emptying Every Rug Doctor is manufactured with heavy-gauge, impact-resistant, virtually indestructible material to assure a lifetime of use Vibrating brush with back and forth motion to thoroughly clean each fiber as it lifts and fluffs the nap leaving a soft, clean, refreshed look to your carpet