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• The air supply to the skimmer can also be adjusted but this is not done often. Typically, <br /> the air supply is set at %turn open. <br /> North Clarifier Hopper rc <br /> Skimmer Inlet <br /> North Skimmer I <br /> Discharge <br /> RAS Valve Adjustment <br /> f <br /> North RAS Discharge <br /> ` E <br /> Clarifier North Hopper RAS and Skimmer <br />