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1. Look at the appearance People have preconceived notions, which is why the appearance of equipment is very important; this is also true for ultra-pure water equipment. One can check whether the welds on the frame are smooth, free of any irregularities; the appearance of these welds also gives an indication of the overall craftsmanship and technical quality of the water purification equipment. When looking at the appearance, it’s not just the casing that matters; small accessories such as screws are also very important. It is also possible to check whether the assembly of the equipment saves space. 2. Check the accessories. There are many different types of accessories for ultra-pure water systems, and all of them are important. The most crucial accessory is the reverse osmosis membrane. When making a purchase, it’s useful to find out what brand of reverse osmosis membrane is used in the system, as well as whether the EDI modules are domestic or imported. 3. Consider the production process and installation The production process of ultra-pure water equipment is directly related to the quality of the water produced by it. In some small manufacturers, the raw materials are not cleaned during manufacturing; for example, many tanks with stainless steel exteriors contain impurities such as iron filings, dust, and oil residues after polishing and grinding. Ultrasonic cleaning is required to ensure that these tanks are clean both on the inside and outside. Production by reputable manufacturers should take place in a sterile environment, which also ensures the quality of the water produced later on.