由于使用方便，紫外灯处理是很普及的控制微生物和消毒的形式。水以控制的流速暴露在紫外灯下，紫外灯可以没活微生物的DNA，阻止复制并因此使用细菌减少。在预处理系统中，当氯/氯胺以及热法无效或不可行时，使用紫外线。进入紫外线的给水必须没有悬浮物固体，因为它们可以“遮蔽”细菌阻止紫外光的充分接触。紫外通过用于控制RO的给水，还用于控制在系统停顿时期非氨处理的循环水。紫外线在处理的水中没有残留，因此只有在紫外光可直接接触微生物时才有效。
Due to its convenient use, UV lamp treatment is a popular form of microbial control and disinfection. Water is exposed to UV lamps at a controlled flow rate, which can eliminate the DNA of living microorganisms, prevent replication, and therefore reduce the use of bacteria. In the pre-treatment system, when chlorine/chloramine and thermal methods are ineffective or impractical, ultraviolet radiation is used. The water supply that enters ultraviolet light must be free of suspended solids, as they can "block" bacteria and prevent full contact with ultraviolet light. Ultraviolet is used to control the feedwater of RO and also to control the circulating water that is not treated with ammonia during system shutdown. Ultraviolet rays have no residue in the treated water, so they are only effective when ultraviolet light can come into direct contact with microorganisms.
3.氯：分子氨对水纯化系统中的元件有不利影响，它会导致超滤和RO膜中使用的膜变质，尽管在饮水中氨浓度适当的情况下，它还是可以导致去离子树脂的降解、脆化、失去产能和树脂降解等，它还会腐蚀不锈钢，尤其是在升高的温度下，并可能在蒸馏系统中携带到产品中并污染产品，因此多数生产纯化水的系统中会考虑在某个点去除氯。
3. Chlorine: Molecular ammonia has adverse effects on components in water purification systems. It can cause membrane deterioration in ultrafiltration and RO membranes. Although the ammonia concentration in drinking water is appropriate, it can still cause degradation, embrittlement, loss of production capacity, and resin degradation of deionized resins. It can also corrode stainless steel, especially at elevated temperatures, and may be carried into products and contaminate them in distillation systems, Therefore, most systems that produce purified water consider removing chlorine at a certain point.
优点：低成本；通用的处理办法；与市政水处理一致；维持残留；易于检测以及维持含量水平；
Advantages: Low cost; General handling methods; Consistent with municipal water treatment; Maintain residues; Easy to detect and maintain content levels;
缺点：能产生THMS；对所有有机物都没有影响；许多终处理系统中都不接受有残留氯。
Disadvantage: can generate THMS; No impact on all organic matter; Many final treatment systems do not accept residual chlorine.