Developed is a parameter series of low flow rate centrifugal/vortex stages of high head (VNN5-25, VNN5-50, and VNN5-80). Serial manufacturing of stages of feeding capacity equal to 50 and 80 m(3)/day with one support has been organized. Preparation of two-support stages manufacturing acid serial production of VNN2-25 stages with a lengthened barrel is being carried out.