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Q » What is the silt density index (SDI) test?

John

03 Nov, 2025

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A » The Silt Density Index (SDI) test is a measure used in water purification to evaluate the potential for membrane fouling in reverse osmosis systems. It quantifies the presence of suspended particles and colloids in water by determining the rate at which a filter becomes blocked. A higher SDI indicates more particulate matter, suggesting a need for pre-treatment to protect and prolong the lifespan of filtration membranes.

Michael

03 Nov, 2025

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A »The silt density index (SDI) test measures the fouling potential of water by determining the rate at which a 0.45-micron filter becomes plugged. It's a crucial indicator for assessing water quality, particularly for reverse osmosis (RO) systems, to predict membrane fouling and ensure effective water purification.

David

03 Nov, 2025

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