Type 3 turbidity curtains or silt curtains, as they are sometimes called, are suitable for use in tidal zones, rivers, and bays. Different filter cloths can be used to accommodate the design of the project and the type of sediment present. This type of curtain is well suited for bridge, intake, and pipeline construction projects. It is available in permeable and impermeable options. American Marine, a division of Elastec, has been manufacturing quality turbidity curtains since 1967.