Zenit PR series flow-makers are built in cast iron with stainless steel propeller. The propellers, of self-cleaning design, are up to 2100 mm in diameter. The electric motors are rated from 0.8 to 5.5 kW with 4 or 6 poles; units have planetary reduction gear.

The large propeller rotating at low rpm allows a large mass of water to be kept in motion at low speed.

PR series flow-makers are mainly used in oxidation and denitrification tanks and in all installations where the formation of sediment on the bottom of the tank has to be prevented.