Silt Density Index (SDI) kit is used to determine the fouling potential of water feeding a membrane filtration process such as a reverse osmosis (RO) system. This test is defined by its specific procedure (ASTM D-4189). The ASTM procedure should be referenced for a more detailed description of the procedure.
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Paper (0.45 micron )
SDI is subjected to silt density index measurement for various water treatment plants mainly RO plants SDI papers are used in SDI test apparatus