Methods to clean the loach:
Put the loach into the water basin, add the right amount of water to ensure that the loach will not swim out on the line, and then evenly sprinkle a layer of salt. Not too much, so that the loach do not adapt to the environment and die.
After two hours, change the water inside the basin. Replace it with clean water and sprinkle an even layer of salt on the surface of the water, with less salt than in the previous step.
After three hours, replace the water in the basin with fresh water. Sprinkle the water with an even layer of salt, less salt than in the previous step.
After three hours, replace the water in the basin and add fresh water. There is no need to add salt at this time. The next morning, change the water again. In the afternoon if the water is still clear then you can cook. If the water is still cloudy, continue to change the water. Basically two to three days, almost loach viscera inside the dirty can come out.