FILTERED WATER
Filtered Water is Purified Water that has been filtered to remove particles that could interfere with the analysis where this water is specified.
It is sometimes used synonymously with Particle-Free Water and Ultra-Filtered Water and is cited in some monographs and general chapters as well as in Reagents, Indicators, and Solutions.
Depending on its referenced location in USP– NF, it is variously defined as water that has been passed through filters rated as 1.2, 0.2, or 0.22 μm, or unspecified porosity rating.
Even though the water names and the filter ratings used to produce these waters are defined inconsistently, the use of 0.2-μm or 0.22-μm filtered Purified Water should be universally acceptable for all applications where Particle-Free Water, Filtered Water, or Ultra-Filtered Water are specified.
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