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Today, EDI industrial ultrapure water treatment equipment has become a fairly common type of pure water treatment device. After many industries and enterprises purchase such equipment, the manufacturers provide users with several precautions and points to be aware of during its operation. One of these is to avoid using the equipment in high-temperature environments. So, why isn’t EDI industrial ultrapure water treatment equipment suitable for operation in high temperatures? Below, Litrelead will explain this in detail. This is because, in high-temperature environments, the performance of reverse osmosis membranes is significantly adversely affected. From big data, we’ve found that when water temperature rises, the desalination rate of reverse osmosis membranes decreases; there is an inverse relationship between the two. The reason is that under conditions of constant flow rate, an increase in water temperature reduces its viscosity, thereby increasing the water flow rate. This, in turn, leads to a decrease in operating pressure and ultimately a reduction in the desalination rate. Therefore, when the water temperature rises, we should take appropriate measures to make adjustments and carry out maintenance based on the actual situation. Furthermore, the effects of high temperatures are not limited to a decrease in the desalination rate. The rise in water temperature provides favorable conditions for certain microorganisms to grow and reproduce, leading to microbial contamination of the equipment. Most bacteria thrive in water temperatures ranging from 15°C to 30°C; as the temperature rises, their metabolic and growth rates also increase. Furthermore, when microorganisms enter the concentrate section of the reverse osmosis system, the nutrients present there serve as nourishment for their growth and reproduction. They can multiply rapidly, and within a few days, a biofilm forms on the surface of the reverse osmosis membranes. This increases the pressure difference between the inlet and outlet of the system; consequently, both the desalination rate and water production volume decrease, while the produced water becomes contaminated. When microbial contamination is detected in EDI industrial ultra-pure water treatment equipment, immediate action should be taken to clean the equipment. For environmental protection reasons, it is recommended to use a 0.1% NaOH solution for chemical cleaning; the cleaning should be carried out at a water temperature below 30 degrees Celsius, in an environment with a pH value of 11–12.