Well water is often disinfected with bleaching powder or bleaching powder tablets. (1) direct chlorination disinfection method: disinfection time and times should be determined according to water consumption and water extraction time. In general, public wells can be divided into 1 time in the morning, 1 time in the afternoon and 1 time in the evening, and domestic wells with less water consumption can also be used. Calculate the well water quantity before disinfection, and the calculation method is [water quantity (m3) = well depth × water surface diameter 2×0.8], and then add 10 piece of bleaching powder or 10 gram of bleaching powder per cubic meter (ton) of water. When adding, put the required bleaching powder or crushed bleaching powder concentrated solution into a bowl, add a small amount of cold water and stir evenly, take bleaching powder supernatant or bleaching powder concentrated solution and pour it into a well, stir the combined water up and down several times with a bucket, and it can be used after half an hour. (2) continuous chlorination disinfection method; Use plastic bags, bamboo tubes, polyethylene beverage bottles and other containers to pack 250 grams or 500 grams of bleaching powder, add a little water to make a paste, and attach a buoy.