Whether industrial salt or edible salt is used in the tap water purification process needs to be considered based on the specific situation.

From a cost and benefit perspective, the price of industrial salt is lower, usually only 400 to 500 yuan per ton, while the price of edible salt is about 800 to 900 yuan per ton. Therefore, in some cases it may be more economical to use industrial salt. However, the particles of industrial salt are larger and may cause damage to equipment. Moreover, the salt content of industrial salt is relatively high, and the concentration of dissolved water is also relatively high, which may have a certain impact on subsequent water treatment operations.

On the other hand, table salt is more expensive, but its particles are smaller and more uniform, which may have less impact on equipment. In addition, given that table salt may be directly related to people's health, in some cases, using table salt may be more appropriate.

In general, there is no fixed answer to whether to process industrial salt or edible salt for tap water purification. The specific choice depends on actual needs and considerations. In specific operations, it is recommended to make a selection based on comprehensive consideration of various factors based on the actual situation. At the same time, in order to ensure the water safety of residents, both industrial salt and edible salt need to comply with relevant national health standards and quality requirements.