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Oil that has low dielectric strength or contains deposits of sludge or other contamination should receive maintenance attention. Low dielectric strength indicates the need for drying by mechanical filter or vacuum dehydrator. High acidity, high power factor or low IFT values indicate the need for reclaiming treatment. When used insulating oils are to be subject to reconditioning or reclaiming processes or both, every advantage possible should be taken of natural precipitation. Considerable savings can frequently be realized in processing used oil if it is allowed to remain in its container undisturbed for at least 24 hours so that water and suspended solids can settle out. The oil can then be removed without disturbing the residue in the bottom of the container; thus, it becomes unnecessary to remove this residue from the processing machinery.