Rotation of the weir provides adjustment. Clockwise rotation will move the weir downward allowing greater flow of the surface layer. Counter-clockwise rotation will move the weir upward resulting in less flow of the surface layer. The center weir should be set so that water does not flow into it, approximately 1/8" to 1/4" above the water surface. If water flows into the hose, it will block the flow of oil. The water must be removed by pulling up on the skimmer and emptying the small amount of water in the hose into the storage tank. Upon routine maintenance of the oil-water separator, inspect skimmer to make sure it is clear of debris. The detail below shows a four (4) float floating oil skimmer arrangement.

NOTE: The addition of this skimmer adds a "FG" to the separator model classification: FGOWS, PFGOWS, FGCO, PFGCO