BECSysBW Auto Backwash Controller

Category: Automated Controllers

BECSysBW filter system backwash controls provide automatic backwash control of up to 16 sand filters, continuously monitoring and controlling system pressures, system flow rate, and backwash holding tank levels.

Patent-pending VFD control technology assures optimal and efficient circulation pump operation. The BECSysBW includes advanced functions such as fireman cycle heater control, fireman cycle Ozone/UV shutdown, and recirculation pump operation.
Email and Text Message Alarm Notifications are supported by the standard integral 100BaseT Ethernet connection, and integration with Wi-Fi networks is supported with the optional BECSys Wi-Fi module. All inputs and system events are recorded in on-board data logs, accessible with BECSys for Windows Windows 8 compatible PC software, which is included with every BECSysBW.
Advanced safety features and multi-level security are standard, and every controller comes with factory-trained start-up and support provided by local distribution. The BECSysBW controller comes with a 5-year electronics warranty.


System Inputs

  • All system inputs feature high/low alarm settings, and are recorded in integral data logs.
  • Optional flow rate sensor
  • Two assignable digital inputs, can be used for measuring:
    • Surge Tank Level
    • Backwash Tank Level
  • Three assignable inputs, configurable as 4-20mA or digital inputs, can be used for measuring:
    • Strainer Vacuum
    • Filter Influent Pressure
    • Surge Tank Level
    • Pump Effluent Pressure
    • Filter Effluent Pressure
    • Backwash Tank Level
    • Turbidity

User Interface

  • 14 line x 40 character backlit LCD, with front-panel contrast adjustment and automatic temperature compensation
  • Single-touch access to Set Points, Relay Modes, Calibrations, Backwash status and settings, Menu access, and Reset Fail/Safes.
  • Optional BECSys Control Supervisor 8.4” color touch-screen display interface

Control Functions

  • Flow: Display and log System Flow, maintaining a total flow volume; Low Flow alarm can disable chemical feeds.
  • Heater: Backwash Fireman Cycle feature and minimum flow rate set point (inhibits heater if flow rate drops below set point).
  • Enzyme: Programmable daily timed feed with start and end time, feed duration, and multiple feeds per day.
  • Polymer: Programmable for daily timed feed or feed-down control based upon turbidity reading and set point.
  • Backwash Tank monitoring: monitor, display and data log backwash tank level
  • Surge Tank monitoring: monitor, display and data log surge tank level
  • Autofill: control water makeup valve to maintain pool level setpoint based upon surge tank (or equivalent) level, with a programmable alternate set point.
  • Sensor wash: programmable sensor wash with start and end time, feed duration, and multiple cycles per day.

Main Recirculation Pump Control Functions

  • On/Off Control: Based upon various sensors and settings such as low surge tank level, strainer high vacuum, Emergency Off, and Fireman Switch settings.
  • TDH: Monitor pump Total Dynamic Head (TDH) with user settable high/low alarm settings.
  • VFD: Variable Frequency Drive interface to control recirculation pump drive level to maintain flow rate or fixed setting. Four Manually-triggered and Four Scheduled alternate profiles are user programmable.

Sand Filter Backwash (BW) Control Functions

  • Initiation: Programmable based upon time, pressure differential, system flow, flow volume, turbidity, or Manual.
  • Standard Operation: Features include a settable Inhibit period, BW Frequency Failsafe, Fireman Cycles, Primary/Priority Valve management, alternating lead filter, BW duration, and dwell time between filters.
  • BW Holding Tank Management: Monitor the backwash holding tank to prevent overflow. Automatically suspend backwash when tank is full, and resume when empty, keeping track of the cumulative backwash time.
  • Advanced Optimization: Accessory relay can be programmed for wide range of options, such as dechlorination in the BW holding tank. Save water by ending a filter backwash early when desired turbidity level reached.

Control Outputs

  • Mechanical Relays: Six (6) standard mechanical relay outputs, supports up to 4 sand filters.
  • Additional Relays: Fifteen (15) additional solid-state relay or mechanical outputs with addition of up to 3 BECSys SRX or MRX relay expansion modules, supports up to a total of 16 sand filters.
  • 4-20mA Outputs: Eight (8) optional separately isolated 4-20mA analog outputs, which can be configured to record any enabled input, or for VFD control of recirculation pump.

Safety Features

  • Manual-On Limit: built-in limits automatically return manual overrides to automatic control, to prevent accidentally leaving relays activated following service/troubleshooting efforts.
  • High/Low Alarm Settings: Programmable high and low alarm settings for all inputs.
  • Emergency Off: Front-panel Emergency Off button immediately halts all control outputs; can be password protected.
  • Internal Safety Shield: Prevents access to high voltage circuitry or wiring during fuse replacement.
  • System Security
    • Three levels of security access codes – Operator (6), Manager (2), and Rep (1).
    • Data logs record history of access identified by user.
  • Data-Logging
    • Data logs maintained in battery protected RAM
    • Log up to 10 to 56 days of input level history (every 2 to 10 minutes)
    • Log up to 1100 system events over a maximum of 14 days (for example, feed cycles or alarms)

Remote Access and Alarm Notification

  • BECSys for Windows Windows7-compatible PC software package included
  • 100 BaseT Ethernet (standard): supports Email and Text message alarm notifications
  • Wi-Fi compatibility with optional BECSys Wi-Fi module
  • Optional MODBUS TCP/IP interface, operates concurrently with BECSys for WIndows
  • Optional 56k data modem: supports Numeric Pager alarm notifications
  • Optional Ethernet with 56k fax/data modem: supports Email, Text message, Fax and Numeric Pager notifications

Regulatory Approvals/Certifications

  • NSF:           NSF Certified and Listed to NSF/ANSI Standard 50
  • USA:          ETL Listed ANSI/UL 61010-1
  • Canada:      ETL Listed CAN/CSA C22.2 #61010-1
  • Europe/CE: CENELEC EN 61010-1, European Community Low Voltage Directive 73/23/EEC
  • Electromagnetic compatibility
    • FCC part 15 sub part B: Radio frequency devices, unintentional radiators
    • EN 61326: EMC requirements for measurement and control equipment
    • European Community EMC Directive 89/336/EEC


  • 5 years electronics; 1 year optional sensors

BECSysBW Data Sheet

BECSysBW Sales Brochure


BECSysBW Quick Reference


About AES

Aquatic Environmental Systems was founded in 1983 to be a resource for swimming pool and water treatment professionals in the Southwest.  From a desk and a telephone in a walk-in closet, we have grown into over 6,000 square feet of space, eleven employees and five service vehicles in Arizona and New Mexico.  This has enabled us to better serve a diverse group of professionals in the water treatment and recreational water community in Arizona, New Mexico, El Paso and West Texas.

Employing the latest in proven technology, we are able to offer solutions for virtually all of the aquatic recreation and water treatment needs of our partners.

With the over 90 years of combined experience of our staff, you can be confident that we will provide solutions that are in your best interests.