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ASTM Variety II is described as water which has larger than 1 MΩ/cm2 resistivity. Lower grades are not really encouraged for most application and Sort I rain water rinses (> 18 MΩ/cm2 might be essential for in particular sensitive application just like HPLC and mass spectrometry. When there are several different approaches for water purification like filtration, different form of purification,

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