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SDI Test Kit

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The ASTM Committe on water has recommended the SDI test or "Microporous membrane pluggage test as method of indicating the quantity of particulate matter in a water supply this method is based on determining the rate of pluggage when water is passes through a 0.45-micron membrane filter at a constant applied pressure
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The ASTM Committe on water has recommended the SDI test or "Microporous membrane pluggage test as method of indicating the quantity of particulate matter in a water supply this method is based on determining the rate of pluggage when water is passes through a 0.45-micron membrane filter at a constant applied pressure.The silt density index is a non-dimensional number calculated from the rate of pluggage.Several RO companies use SDI as a means of specifying the maximum level of suspended solids allowable in the feedwater to their systems in order to maintain membrane performance warranties.Some companies require daily measurement and reporting of SDI.Many specifications and warranties for spiral-wound elements have called for SDI values of less than four.