A-1 Concrete Leveling raises sunken concrete slabs through a hydraulic pressure injection process using patented equipment. We drill a series of 1" diameter holes through the sunken concrete slab then hydraulically inject a grout to fill the voided areas below the slab. This raises the slab back to its original position, saving 50%-70% versus replacement and is environmentally friendly. America's Largest Concrete Leveler! "We Pump It Up!"