The replacement frequency of filter element in industrial sewage treatment will be affected by many factors, so it is difficult to give a fixed standard time. In general, if the treated sewage quality is poor and the impurity content is high, the filter element may need to be replaced every 1-3 months. If the sewage quality is relatively good, and the pre-treatment is relatively perfect, the replacement frequency of the filter element may be about 3-6 months. In addition, the material and type of filter element will also have an impact on the frequency of replacement. For example, some high-precision membrane filters may need to be replaced more frequently, while filters with strong stain resistance have a relatively long replacement cycle. The running time and load of sewage treatment equipment, the requirements of the filtration process and the maintenance situation will also affect the replacement frequency of the filter element. In order to determine the appropriate replacement time, it is usually necessary to regularly monitor the filtration effect and the status of the filter element, such as the change of pressure difference, the water quality, etc., and decide when to replace the filter element according to the actual situation.