Distillery Products Cold Water ExtractCheck draff for residual sugars. WashEfficiency of fermentation. Pot AleResidual alcohol check. Spent LeesResidual alcohol check. EffluentFinal checksCheck that effluent complies with environmental standards. BOD/CODMeasure organic and chemical material. CopperMinimise outgoing copper. Residual alcoholConfirm that alcohol has not found its way into waste material SolidsTotal and soluble solids.