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Silt Density Index (SDI)Advanced Reverse Osmosis TechnologySilt Density Index (SDI) - Silt Density Index is an empirical test used to characterize the fouling potential of a feedwater stream. Test is based on measuring the rate of plugging a 45 micron filter using a constant 30 psig feed pressure for specified period of time. SDI15 refers to a silt density index test which was run for 15 minutes. Typically spiral wound systems require an SDI < 5 and hollow fiber systems require an SDI < 3. Most deep well waters have an SDI of 3 and most surface water have SDI’s greater than 6. For further information or assistance please contact Reverse Osmosis Chemicals International on +44 (0) 161 877 2334 or e-mail info@rochemicals.com.
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