Reverse Osmosis Chemicals
Manchester M32 0FP
t: +44 (0) 161 877 2334
f: +44 (0) 870 135 6389
|Silt Density Index (SDI) - Reverse Osmosis Systems|
Silt Density Index (SDI) - The Silt Density Index or SDI 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.
Most deep well waters have an SDI of 3 and most surface waters have SDI’s greater than 6.
Technical support and advice
Reverse Osmosis Chemicals International work closely with a diverse range of global organisations, intelligently combining advanced treatment technologies with practical solutions to resolve complex issues. If you have a project you would like to discuss, or you require technical support and assistance; or if you simply have a question about our reverse osmosis technology solutions please contact one of our specialist advisors using our Technical Support page or call us on +44 (0) 161 877 2334.