Does your seawall look like this? In Southwest Florida, this is very common due to the weather, and erosion. When you begin to see voids appear near your seawall, you can either leave it alone and watch your grass and soil quickly wither away into the water; or you can give us a call! We specialize in void fills for seawalls. We inject a polymer foam into the ground that actually stabilizes it so things stay put.
This is a picture of our crew members injecting the soil stabilization product along the seawall. This seals the seams of the wall itself while filling the voids caused by the erosion. This is important because it will restabilize the wall and stop further damage or soil loss into the water.