... stroke length and percentage rate. The Chemical Dosing System prevents membrane scaling.Antiscalant Dosing SystemOne metering injection ... Membrane Housing: corrosion resistant, fiberglass construction, 1000 psi rating.2. Membranes: Dow Filmtec or Fluid Systems seawater, TFC ... equivalen. On larger units ZYI uniquely design pumping system, including multi-stage centrifugal pump, energy recovery turbine ...