Abstract: An open-ended cylindrical tower having an upper outlet end and a lower inlet end with a coaxial open center pump intermediate the inlet and outlet ends of the tower for imparting relatively high kinetic energy to fluid to be passed through the tower with a vortical motion under relatively low pressure, and a velocity deflector at the outlet end of the tower jointly defining therewith an unobstructed annular discharge opening and serving to at least partially deflect the axial velocity of the fluid and amplify its angular escape velocity through the discharge opening to effect a 360.degree. radiating spray pattern while minimizing pressure drop during discharge.