In parallel/counter current dryers design, the spray and the air are introduced at opposite ends of the dryer, with the atomizer positioned at the top and the air entering at the bottom. The counter current dryers offer more rapid evaporation and higher energy efficiency, because the driest particles are in contact with hottest air. It normally uses nozzles for atomization because the energy of the spray can be directed against the air movement. Soaps and detergents are commonly dried in counter-current dryers.