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However, filtration could be acceptable, for example, when used for reducing microbial/particulate loads in potable water used as an ingredient in chemical manufacturing where water need not be sterile. Chlorination of potable water is an effective treatment if minimum levels of 0. 2mg/liter of free chlorine are attained. Be aware however, that any carbon or charcoal filters in the system will remove this protective chlorine and thus eliminate any inhibitory effect on microbial growth after this point. USP WFI is usually produced in a continuously circulating system maintained at an elevated temperature. The high temperature, maintained uniformly throughout the system by constant circulation, prevents significant microbial growth. A temperature of 80^oC is commonly used and is acceptable. Somewhat lower temperatures may also be acceptable, provided the firm has adequate data to demonstrate that a lower temperature works as intended. If WFI is held at ambient temperature rather than recirculation at elevated temperature, it must be dumped or diverted to non-WFI use 24 hours after being produced.