Fleck Model: 3900

3″ Commercial Water Conditioning Control

Fleck 3900
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  • Fully adjustable 5-cycle control delivers controlled upflow backwash, downflow brining, slow rinse, rapid rinse and downflow service.
  • Designed for single tank or multi-tank systems, alternating or interlocking.
  • Continuous flow rate of 250 gpm.
  • Protective NEMA 3R enclosure is water resistant, rain tight, corrosion resistant and UV stable.
  • Operational no hard water bypass during regeneration.
  • Choice of 7 or 12 day clock or meter initiated regeneration.


  • Backwash filter
  • Meter initiated regeneration
  • Upflow regeneration
  • No hard water bypass
  • Electronic timer

Valve Specifications

Valve MaterialLead Free Brass
Inlet/Outlet3" NPT

Flow rates (50 PSI Inlet) - Valve Alone

Continuos (15PSI Drop)Top Mount: 250 gpm
Peak (25 PSI Drop)Top Mount: 325 gpm
Max.Backwash (25 PSI Drop)100 gpm


Time AvailableElectromechanical: 164 minutes

Meter Information

Meter Accuracy Range:7 - 300 gpm +/- 5%
Meter Capacity Range:Std: 3,750 - 63,750 gal
Ext:18,750 - 318,750 gal


Distributor Pilot3" Pipe
Drain Line 2" NPT (Female)
Brine Line1" NPT (Male)
Mounting Base Top: 6"-8" Threaded or Flange
Height from top of tank 15"

Tank Application - can regenerate/backwash the following:

Water Softener24"-63" diameter
Iron, Sediment, Carbon, and Neutralizing Filters24"-42" diameter

Additional Information

Electrical Rating24v, 110v, 220v-50 Hz 60 Hz
PressureHydrostatic: 300 psi
Working: 20 - 125 psi
Temperature34° - 110° F