反渗透（RO）和去离子（DI）是通用的水纯化步骤。

Reverse-osmosis (RO) and deionization (DI) are common water purification steps.

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水纯化系统可能跟随在初始的预处理步骤后面，根据水规格参数的不同有多种顺序和系统设计。

Water purification systems may follow the initial pretreatment steps in various sequences depending on the characteristics of the water and the design of the system.

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纯化水由一经过验证的水纯化系统制备，每隔7天取样一次，并按欧洲药典纯化水规格进行检测。

Purified Water is prepared by a validated water purification system. Purified water is sampled at an interval of 7 days and tested according to Ph. Eur purified water specifications.

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