When air is compressed, friction causes the actual air temperature to rise, greatly increasing its ability to hold moisture. At 100 PSIG the quantity of moisture commonly held in eight cubic feet of air is reduced in an area 1/8 its original size. The result of compression is hot, wet, dirty air it is essential to treat processed air before it can do any damage. By drying and filtering compressed air, operation efficiency can be maximized, and equipment productivity and longevity greatly increased. A properly designed air system will pay for itself.