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Fleck Simplex 3900 Water Softener


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Water Softeners | Fleck Simplex 3900

SKU: S10-FLS39C Category:


Fleck Simplex 3900 Water Softener

Units come supplied with:

  • Fleck 3900 Softener Control Valve – either Time Clock or Metered
  • Appropriate size of WRAS approved resin vessel
  • Riser with bottom distributor attached to the riser tube and top basket (cut to vessel size)
  • Appropriate volume of Softener Resin
  • Appropriate size brine tank
  • Drain hose 3m
  • Brine fill/ Draw tube 3m

Installation is easy

  • Connect the inlet and the outlet
  • Connect the drain
  • Connect the brine system
  • Plug in the transformer

General conditions for installation

  • Inlet/ Outlet connection – 3” BSP
  • Drain Connection – 2” Hose
  • Electrical Rating – 230-24V / 50 Hz
  • Power Rating – 340 watts
  • Min inlet pressure – 200 kPa (2bar)
  • Max inlet Pressure – 700 kPa (7bar)
  • Vacuum – Not permitted
  • Average Pressure Loss – 100 kPa (1bar)
  • Max Water Temp – 43ºc

General Information

The Fleck 3900 Simplex Water Softener Units are suitable for commercial, industrial and residential applications. All of our systems are either Time Clock or meter controlled (please select from the drop down menu)

The benefit of a meter controlled system is that it allows the system to calculate your water usage and instigate a regeneration cycle only when you have consumed enough water for the resin bed to be exhausted. These systems prevent any unnecessary water wastage and also ensure that your resin bed is never running past the state of exhaustion.

Timer controlled softeners allow you to set a particular time for regeneration and are also consistent and reliable.

We supply Simplex, Duplex, Triplex and bespoke water softening systems. Simplex systems are ideal in settings where it is not essential to have a soft water supply 24/7. During the regeneration process, your system is likely to be offline for at least 2 hours during which time, a simplex system will pass hard water until the regeneration process has finished. If the system is timer controlled, this can be manually set to a time that you are less likely to require soft water.


Dimensions (mm)
Resin LitresValve H1Vessel H2Vessel B1Brine Tank H3Brine Tank B2Softener HTInlet / Outlet


General conditions for installation
Connection Inlet & Outlet3” BSPF
Drain Connection *2” BSPM
Electrical Rating230-24V / 50 Hz
Power Rating340 watts
Minimum Inlet Pressure200 kPa ( 2 Bar )
Maximum Inlet Pressure700 kPa ( 7 Bar )
VacuumNot permitted
Average Pressure Loss **100 kPa ( 1 Bar )
Maximum Water Temperature43ºc


* Open drain required
** It is recommended that a 20um Pre-cartridge filter be installed prior to the inlet of the water softener


TypeStrong acid cation resin – softening, food grade quality
Life Span15 years under normal operating conditions


Ion exchange
Litres of Resin4005006007008009001000110012001300
Softener Capacity
as CaCO³
Salt Conskg/reg4860728496108120132144156


Flow Rate
Litres of Resin 4005006007008009001000110012001300
 nominal m³/hr14182125283235394242
 peak m³/hr16202428323640444848
minimum metered1660 Litres/Hour


Time Clock Version7 or 12 days ( 2.00am default time regeneration )
Volume Delayed or ImmediateNXT Electronic
ManualManual operation as required

The interval between regenerations should not be more than 4 days, this is to prevent bacteria growth.

Regenerations should be more than 8 hours apart.


Regeneration water usage
Litres of Resin 4005006007008009001000110012001300
1) BackwashLitres9509509501330133019001900266026602660
2) Brining + Slow RinseLitres450650870790124010901190125013401820
3) Fast RinseLitres1330133015202130213030403040425042504250

Fleck 3900 Service Kit

Fleck Valve 3900 Service Kit
Piston Assy Upper 3150/3900
Seal and Spacer Kit 3150/3900 Upper
Piston Assy 3900 Lower NBP
Seal & Spacer Kit Lower 3900
Brine Valve 1800 Repair Kit 3150/3900
£583.34Buy Now
Fleck Valve 3900 Microswitch Kit
3900 Microswitch Kit£28.78Buy Now

Fleck 3900 Manual

Adobe PDF

1 Year Warranty


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What is a Simplex Water Softener?

A simplex water softener consists of one vessel containing ion exchange resin. Once the iron exchange resins are exhausted, the water softener will go into the regeneration sequence. During the regeneration sequence that takes about two hours, there will be no water passed through the softener to service. If the water softener is time controlled, it is possible to set the regeneration time to 3am when there is usually no requirement for water. If the water softener is a water meter controlled unit, it is more difficult to gage what time the water softener will regenerate. If a continuous supply of softened water is required, it is advisable to install a duplex water softener.

What is a Duplex Water Softener?

A duplex water softener consists of two vessels containing ion exchange resin, once the first column of resin has exhausted and goes into regeneration, the second column goes into service. This maintains soft water to service at all times. Duplex water softeners are usually water meter controlled but in some cases, duplex water softeners can be time clock controlled.