1: When the height of the water line is less than 20cm from the shore, it will make direct contact and friction with the hard structures on the shore (such as stones, concrete dykes, metal guardrails, etc.), and these hard edges are very easy to scratch the shell of the equipment.Please adjust the water level at least 20cm height difference from the shore.
2: Check whether there are sharp protrusions along the shoreline, which may also cause scratches when the equipment passes by.