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Sustainable and stable operation of ultra-pure water equipment. Sustained stability should include two aspects: sustained water quality stability, that is, whether the quality of the water produced will decline after continuous water extraction over a period of time. Industrial pure water production systems often use mixed-bed reactors and EDI modules to produce pure water. Compared to systems that use mixed-bed reactors for producing ultra-pure water, EDI systems are much more stable, although they are also significantly more expensive. To ensure the stability of the equipment, an EDI system can be chosen for pure water production. Ultra-pure water equipment goes through four stages of filtration: pre-treatment, reverse osmosis membranes, EDI modules, etc. They all have a limited lifespan. Pretreatment actually serves to protect the reverse osmosis membranes; if these membranes fail, the load on them increases and their lifespan is shortened. If operation continues, the quality of the pure water produced declines, which in turn increases the burden on the reverse osmosis membranes and further shortens their lifespan. The ultimate result is an increase in the operating costs of ultra-pure water equipment. The above is the editor’s explanation on how to ensure the stable operation of industrial pure water equipment. The stable operation of such equipment is closely related to the processes used as well as regular maintenance; therefore, it is advisable to learn more about how to maintain ultra-pure water equipment in order to ensure its better performance.