Howell Concrete Lifters. 

They spent all day pumping cement under the cement apron around the pool. Filled in huge holes/gaps between the wall of the pool and the ground. Also leveled several huge pieces of concrete. Now the cement around the pool is secured, level and no critters living under/around the pool that could chew piping.

 

  In the pictures below you can see the drilled holes in cement
where they pumped the slurry in.