What is the difference between demineralized water, distilled water, pure water, and deionized water?

1. Deionized water: Deionized water refers to the finished water obtained by using various water treatment processes to remove impurities in water such as suspended solids, colloids, and inorganic cations and anions. Desalinated water does not mean that all salts in the water have been completely removed; due to technical constraints and considerations related to production costs, trace impurities are allowed to be present in desalinated water depending on its intended use. The fewer impurities in the desalinated water, the higher its purity. 2. Distilled water: It is water that has been distilled and then condensed. Water that is distilled twice is called double-distilled water, while water that is distilled three times is called triple-distilled water. Water may contain substances with boiling points close to that of water, which are difficult to remove by distillation. 3. Deionized water: Water that has passed through cation and anion exchange columns, with all impurity ions removed, is thus called deionized water. Deionized water removes ionic compounds; organic substances that are not ionized or microorganisms cannot be removed in this process. 4. High-purity water: This is a general term for water of high purity. Whether it is distilled water, water produced by ion exchange, EDI (Electrodeionization) technology for continuous desalination, electrodialysis, reverse osmosis, membrane separation, or any combination of these processes, water of such high purity can be referred to as high-purity water. Some also say that high-purity water specifically refers to deionized water that has been treated using mixed-bed systems, and its purity is higher than that of distilled water; the conductivity of high-purity water

Deionized water: https://baike.baidu.com/item/%E9%99%A4%E7%9B%90%E6%B0%B4; Distilled water: https://baike.baidu.com/item/%E8%92%B8%E9%A6%8F%E6%B0%B4. In the chemical industry, when there are no specific requirements, the distinction between them is not very clear.

Deionized water, distilled water, deionized water, high-purity water. (from low to high)

What was said about the first three floors is absolutely correct; it all relates to the purification of water, with only different specifications

1. Deionized water: Deionized water refers to the finished water obtained by using various water treatment processes to remove impurities in water such as suspended solids, colloids, and inorganic cations and anions. Desalinated water does not mean that all salts in the water have been completely removed; due to technical constraints and considerations related to production costs, trace impurities are allowed to be present in desalinated water depending on its intended use. The fewer impurities in the desalinated water, the higher its purity. 2. Distilled water: It is water that has been distilled and then condensed. Water that is distilled twice is called double-distilled water, while water that is distilled three times is called triple-distilled water. Water may contain substances with boiling points close to that of water, which are difficult to remove by distillation. 3. Deionized water: Water that has passed through cation and anion exchange columns, with all impurity ions removed, is thus called deionized water. Deionized water removes ionic compounds; organic substances that are not ionized or microorganisms cannot be removed in this process. 4. High-purity water: This is a general term for water of high purity. Whether it is distilled water, water produced by ion exchange, EDI (Electrodeionization) technology for continuous desalination, electrodialysis, reverse osmosis, membrane separation, or any combination of these processes, water of such high purity can be referred to as high-purity water. Some also say that high-purity water specifically refers to deionized water that has been treated using mixed-bed systems, and its purity is higher than that of distilled water; the conductivity of high-purity water

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Distilled water is the purest, followed by pure water, deionized water, and demineralized water

That’s right; distilled water is the purest, followed by purified water, deionized water, and demineralized water