Using A-1's patented system, we can put your concrete back on level and save you 50-70% off the cost of tearing it out and replacing it...and it's ready to use the same day! First, a minimum amount of holes are drilled in the sunken concrete. Next, A-1 pumping compound is pumped from our truck into each hole. The compound works hydraulically underneath the concrete, raising it back to it's original position. Once the desired result is obtained, the holes are sealed off using a durable cement mixture. Then we clean up our mess and get out of your way.