Aeration and bacteria have little or no impact on soil. And he clearly states it is soil and bank erosion. Trash pump that water out, get the backhoe digging. He already fixed the shore and fenced it from the cows tearing it up. Some people alos make a marsh or bog infront of thier ponds to trap soil runoff or screen it before it reaches the pond. Natural pond have features like this quite often, but not manmade. Probably best term would be a sediment trap.