Salt Density Index - Reverse Osmosis Systems

Salt Density Index - Salt density index is a commonly mis-quoted term that actually refers to Silt Density Index or SDI. Silt density index is an important empirical test used to characterize the fouling potential of a reverse osmosis feedwater stream. The SDI test is based on measuring the rate of plugging a 45 micron filter using a constant 30 psig feed pressure for a specified period of time. SDI 15 refers to a silt density index test which was run for 15 minutes.

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