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Silt Density Index For Reverse Osmosis

Silt Density Index For Reverse Osmosis


With SS Needle Valve, Quick Release
Coupling, Air Vent Valve, Paper Holder, Water Holder,
Pressure Gauge, 500 ml Measuring Jar & Filter Paper

Suspended solids and colloidal materials in feed water are one of the biggest problems in reverse osmosis systems. Even though most systems have some pretreatment including 5-micron prefilters, these fine particles are responsible for fouling of reverse osmosis membranes.

Silt Density Index For Reverse Osmosis
Silt Density Index For Reverse Osmosis


In order to have some measure of the degree of this fouling problem, a concept called Silt Density Index is used. Here a 0.45-micron filter is exposed to the feed water under pressure and filtration rates are calculated. A detailed description of the test is available in our operating
Procedure of the product manual.

An SDI of less than 5 is considered acceptable for the reverse osmosis systems. This means that at values of SDI of less than 5, the membranes should foul at a very low rate. Even though the concept works most of the time, there are exceptions when a lower SDI (less than 3) is desirable due to the nature of the suspended solids in that feed water.
An SDI measurement kit is available and is shown below:


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