How long does it take to manually clean up the silt in the 300 square sedimentation tank?

It takes a week to manually clean up the silt in the 300-square sedimentation tank. According to relevant public information, for ponds with small area (for example, less than three acres) that are inconvenient to be dredged by machinery (for example, bulldozers and mud pumps), manual dredging can be adopted. Manual dredging is time-consuming and inefficient, but the cost is relatively low. Generally need 1 week. After a round of culture cycle, a large number of feed residues and fish manure accumulated at the bottom of the pond, and a large number of harmful metabolites accumulated, resulting in black and smelly sediment. Farmers generally use dry ponds, dredging and dry ponds. Generally, after the fish is taken out of the dried pond, farmers use excavators to clean up the silt in winter, dig a wide (10- 15 m) and deep (1-kloc-0/.5 m) ring ditch, and then dry the pond for 2-3 months.