First, look at the results: no matter what model or process technology it is, the water quality after treatment must reach the demand value. Second, the technical situation: from the manufacturer's strength, technology, cases to find. 3. Equipment costs: Abandon direct contact between dealers and traders, and reduce equipment costs and operating costs as much as possible on the premise of meeting demand and equipment quality. 4. Management situation: whether it is simple and easy to manage, whether manual operation is required, and whether the operation and maintenance of the equipment are simple.

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