Iron analyser SDIEASY

waterpressuredensity

The Silt Density Index (SDI) measures the time it takes to filter a fixed volume of water through a standard 0.45 µm microfiltration membrane with a constant given pressure of 2.07 bar (30 psi). The difference between the initial time and the time of a second measurement after typically 15 minutes (after silt build-up) represents the SDI valueThe instrument SDI-Easy is composed by a plastic handbag that contains the following components: membrane filter support, membrane filters (kit 25 membranes), manometer, pressure regulator, needle valve for pressure adjustment, timer, pipes and fittings. Silt density index is essential, for this reason Everblue offers two types of SDI kits (testers), manual and automatic/electronic. The most frequent obstructions of the RO and nanofiltration membranes is caused by colloidal substances (aluminosilicates - clay). These materials often deposit together with iron corrosion products, precipitated iron hydroxide and biofilms. The SDI test is used to predict and thus prevent fouling of the membrane surface.