The operation steps are as follows:
1. Put the fresh Meretrix meretrix and clean water into the container, and the clean water should not pass through the Meretrix meretrix.
2. Put about 10 coins in the basin.
3. Take another basin and buckle it on the basin containing clams.
4. Shake in different directions for a few minutes.
5. Open the buckled basin, and you can see that the water in the basin is turbid.
6. Pour out the dirty water and replace it with clean water.
7. Cover the basin again and shake it according to the previous steps.
8. After repeatedly changing water and shaking for 3-5 times, clean the fresh clams (clean the surface by rubbing when shaking) and spit out the mud in the stomach.