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WECO A400E-1665 Backwashing Filter with A400E Anion-Exchange Resin for Silica Reduction

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  • Industrial demineralization
  • Silica reduction
  • High flow rate
  • Minimum pressure drop

The WECO Backwashing filter with A400E ion-exchange resin is a Point-Of-Entry (POE) filtration system for municipal and well water supplies. The main application of this filter system is removal of silica form well and municipal water supplies. The WECO system is compatible with residential, industrial, institutional and medical water supplies. This silica removal system can be used stand-alone or in conjunction with other WECO filtration systems. Other applications for this filtration system are:

  • Industrial demineralization

WECO backwashing filters are available in a variety of sizes. Please consult with WECO Technical Support for assistance in selecting the proper size filter to meet your water purification requirements.

A400E is a clear polystyrene gel crosslinked with DVB (divinylbenzene) anion ion exchange resin. It is a Type I strong base resin supplied in the chloride form. A400E resin is highly selective for the removal of silicate in municipal and well water supplies. The ion-exchange resin is manufactured for drinking water and food plant applications. A400E gel resin beads have a high removal capacity and efficient regeneration properties. Pressure drop remains low and backwashing requirements are minimized. The resin is typically regenerated with caustic soda.

Silica (SiO₂) is the second most common element on Earth. It is naturally occurring in quartz and sandstone rocks. When water flows through these deposits, it picks up silica. Silica is found in nearly all water sources including groundwater, wells, and municipally-treated water. Silicate (also silicic acid) is found in surface and well water in the range of 1 - 100 mg/L. Silica has not been proven to be harmful to humans. However, it can be problematic in industrial water uses. Cooling towers, boiler feeds, semi-conductor manufacturing, and carwashes require silica-free water. Silica leaves behind deposits on equipment and surfaces, often resulting in a hard to remove scale build-up. Scale build-up can lead to expensive maintenance and replacement of damaged or rusty components and pipes.

The WECO backwashing filter consists of a Structural Poly Glass™ pressure tank and a Fleck 5810 XTR2 touch screen controller. Structural Poly Glass™ is the ideal filter media tank for residential and industrial water filtration and conditioning duty. The pressure tank has an attractive stainless-steel outer jacket for good looks, and durability. This combination provides unmatched strength and chemical resistance for years of trouble-free service. The slim diameter makes installation easy in tight locations and does not take up a lot of floor space. The Fleck XTR2 controller is constructed of a fiber-reinforced polymer valve body for superior strength and durability. It is non-corrosive and UV-resistant. The controller uses an optical sensor for precision cycle positioning. The controller is easily programmed and user-friendly due to detailed screen descriptions, color LCD display, and familiar icons. The intuitive navigation is easy with a large LCD screen. The controller has an internal memory that remembers your settings during a power failure. It has a convenient Vacation Mode to save water when not in use. The password lock-out prevents unauthorized users from changing the settings. An audible alarm sounds if there is a controller

error. Diagnostics can be downloaded via USB should the need arise. The Fleck XTR2 controller has feature rich diagnostics including:

  • Current Flow Rate
  • Peak Flow Rate (can be reset)
  • Totalizer (can be reset)
  • Last Regeneration
  • Daily usage for last four weeks
  • Software Version
  • Number of Regenerations
  • Regeneration Interval
  • Usage since last regeneration
  • Last program change

Water enters the top of the tank through the Fleck control valve and passes downward through the A400E resin. The WECO backwashing filter will clean itself periodically by rinsing away solid impurities that can plug the resin bed. The control valve automatically starts the backwash process. The backwash procedure is an operation where water passes backward through the filter media at a fast flow rate. It enters the tank at the bottom through the riser tube, then flows upward through the filter medium, exiting at the control valve and sent to waste. The rapid, turbulent upward waterflow, in addition to flushing away particulate matter, loosens and resettles the media bed. A regeneration cycle flushes the resin bed with caustic to strip off silicate (or other anions) and load the resin’s exchange sites with OH ions, preparing it for another filtration cycle. The treated and conditioned water enters the riser tube at the bottom of the mineral tank, passing upward and exiting the filter through the control valve.

Controller Certifications:

  • Tested and Certified by the WQA to NSF/ANSI Standard 44 for Water Softener Performance.
  • Tested and Certified by the WQA to NSF/ANSI Standard 372 for Lead Free Compliance.

NSF Tank Certifications:

  • Safety factor: 4:1
  • Minimum burst at 600 psi
  • Tested to 100,000 cycles without leakage

Residential tanks 6"-16" in diameter are Certified to NSF 44

  • Maximum operating pressure: 150 psi
  • Maximum operating temperature: 120° F

Vessels tested and certified by the Water Quality Association (WQA) to NSF/ANSI Std. 44 for material safety and structural integrity requirements and Std. 372 for low lead compliance.

Resin Certification:

  • Certified by the WQA to NSF/ANSI-61 Standard


Valve Material Fiber-reinforced polymer

Inlet/Outlet 1"

Cycles 3-5


Continuous (15 psi drop) 36 GPM

Cv (flow at 1 psi drop) 5.4

Max. Backwash (25 psi drop) 28 GPM


Downflow/Upflow Both

Adjustable Cycles Yes

Time Available XTR2: 0-240 minutes per cycle


Meter Accuracy .25 - 15 GPM +/-5%

Meter Capacity Range (gal.) LXT: volume calculated XTR2: 1-99,999,999

More Information
UPC 810388030113
Model Maximum Service Flow (gpm) Tank Size Diameter (inches) Minimum Backwash Rate (gpm) A300 Process Media
Bed depth (inches) Weight (lbs) Volume (cu. ft.)
A300E - 0635 3 6 x 35 6 10 28.5 0.16
A300E - 0735 4 7 x 35 8 11 42.8 0.25
A3000E - 0840 5.5 8 x 40 10 12 57.0 0.33
A300E - 0948 6 9 x 48 12 13 85.5 0.50
A300E - 1054 8 10 x 54 16 14 114.0 0.66
A300E - 1252 11 12 x 52 22 16 171.0 1.04
A300E - 1354 13 13 x 54 26 17 222.0 1.30
A300E - 1465 15 14 x 65 30 18 285.0 1.60
A300E - 1665 20 16 x 65 40 20 339.0 2.33
QA Image
PDF Guide

Control Head Installation

A300E Process Medium

Recommended Setup

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