Confirm that RO feedwater turbidity and fouling potential, as measured by a 15-minute silt density index (SDI15), are within the limits
specified on the LG Chem product data sheet or in the LG Chem product or performance warranty. Please refer to “Silt Density Index
Procedure (SDI15) - TB 107” for more information. During system start-up, spikes of high turbidity may pass through the pretreatment
system until the pretreatment system stabilizes. These spikes will result in membrane fouling that decreases permeate flow and
requires operation at higher pressures to compensate for the decreased flow.