Keensen BW-4040 Brackish Water RO Membrane Element

Keensen BW-4040 Brackish Water RO Membrane Element

$268.00
$268.00 $328.00
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Keensen BW-4040 Brackish Water RO Membrane Element
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Product Snapshot

BRAND Keensen

Manufacturer brand

MODEL BW-4040

4" × 40" RO membrane element

MEMBRANE TYPE Brackish Water RO

TFC polyamide membrane

PERFORMANCE 2,500 GPD / 99.60%

Under standard test conditions

FEEDWATER TDS 2,000–8,000 ppm

Recommended feedwater range

FORMAT Standard 4040 Element

For compatible 4" RO pressure vessels

Need help confirming compatibility or ordering multiple membranes?

Send us your existing membrane model, RO vessel size, system flow rate, feedwater source, required quantity and delivery postcode. Crystwater can help confirm compatibility, bulk pricing and freight options before you order.

Replacement matching Bulk pricing Freight planning
Bulk / Technical Enquiry

For trade, maintenance or project supply orders, include your required quantity and delivery postcode.

Keensen BW-4040 Brackish Water RO Membrane Element

Keensen BW-4040 Brackish Water RO Membrane Element

Industrial 4" × 40" brackish water RO membrane element for commercial and industrial reverse osmosis systems.

Suitable for replacement, maintenance and project supply where model specifications, feedwater conditions and operating requirements are matched.

Crystwater supports direct purchase, bulk pricing and technical selection for commercial RO systems.

4040 Industrial RO Element Brackish Water RO Membrane Bulk Pricing Available Technical Selection Support
AU Stock Available Tax Invoice Supplied Bulk Pricing for 2+ Units Standard 8040 Replacement Format Freight Confirmed by Postcode Technical Matching Support
SKU: CW-RO-BW-4040
$268.00
$268.00 $328.00

For 2+ units, project supply or full RO skid membrane replacement, contact us before ordering for bulk pricing and freight support.

Bulk / Technical Enquiry
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4" × 40" Commercial RO Membrane Standard 4040 format for compatible commercial and industrial RO pressure vessels.
✓
Brackish Water RO Application Suitable for BWRO replacement, bore water treatment and process water applications.
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Stable Test-Condition Performance Typical 2,500 GPD permeate flow and 99.60% stable salt rejection under standard test conditions.
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Bulk & Technical Supply Support Crystwater can assist with replacement matching, project quantities and freight planning.
Product Overview

The Keensen BW-4040 is a 4" × 40" brackish water reverse osmosis membrane element for commercial and industrial RO systems.

It is suitable for replacement, maintenance and project supply where a standard 4040 membrane format is required and feedwater conditions, operating pressure and system design are appropriate.

Crystwater supplies this membrane for direct online purchase, while also supporting contractors, maintenance teams and industrial users with replacement matching, bulk pricing and technical selection support.
Specifications

Brand: Keensen

Model: BW-4040

SKU: CW-RO-BW-4040

Membrane type: Brackish Water RO

Membrane material: TFC polyamide

Nominal size: 4" × 40"

Format: Standard 4040 RO membrane element

Active membrane area: 85 ft² / 7.9 m²

Concentrate channel spacer: 28 mil

Typical permeate flow: 2,500 GPD / 9.5 m³/day

Stable salt rejection: 99.60%

Minimum salt rejection: 99.50%

Recommended feedwater TDS: 2,000–8,000 ppm

Application: Commercial and industrial RO systems
Standard Test Conditions

Performance data is based on standard membrane test conditions. Actual system performance may vary depending on feedwater quality, temperature, pressure, recovery rate, pretreatment condition and system design.

Standard test conditions include:

  • Test solution: 2,000 mg/L NaCl
  • Temperature: 25°C
  • pH: 7.5–8.0
  • Operating pressure: 225 psi / 1.55 MPa
  • Recovery rate: 15%
  • Permeate flow tolerance: ±15% for a single membrane element
Operating Limits & Conditions

The Keensen BW-4040 membrane element should be operated within the recommended system design and feedwater limits. Actual performance depends on feedwater quality, pretreatment, operating pressure, recovery rate, temperature and cleaning condition.

Recommended and maximum operating limits include:

  • Maximum working pressure: 600 psi / 4.14 MPa
  • Maximum feedwater temperature: 45°C
  • Maximum feedwater SDI15: 5.0
  • Maximum feedwater flow: 3.6 m³/h
  • Maximum free chlorine concentration in feedwater: 0.1 mg/L
  • Feedwater pH range during continuous operation: 3–10
  • Feedwater pH range during chemical cleaning: 1–13
  • Maximum pressure drop per single membrane element: 15 psi / 0.1 MPa
  • Recommended feedwater TDS range: 2,000–8,000 ppm

For best membrane life, the RO system should include suitable pretreatment and should be operated within the membrane manufacturer’s design limits. Contact Crystwater before ordering if you are replacing membranes in a multi-element skid or if feedwater conditions are uncertain.
Typical Applications

Typical applications include:

  • Commercial RO systems
  • Industrial process water treatment
  • Surface water treatment after suitable pretreatment
  • Groundwater and bore water desalination
  • Commercial drinking water RO plants
  • Boiler feedwater pretreatment
  • Water treatment contractors and maintenance replacement
  • Medicine, chemical, beverage, electricity and other industrial utility water applications
RO Membrane Selection Guide

Do not select a 4040 RO membrane by size alone.

Before ordering, check the existing membrane model, RO pressure vessel size, system flow rate, feedwater TDS, operating pressure, recovery rate, pretreatment condition and cleaning history.

The Keensen BW-4040 is recommended for feedwater with TDS between 2,000–8,000 ppm, subject to suitable pretreatment, SDI control, chlorine removal, operating pressure, recovery rate and system design.

For multi-element RO skids, industrial replacement programs or uncertain compatibility, contact Crystwater before purchase so we can help confirm a practical replacement option.
Shipping, Bulk Orders & Support

For bulk orders, OEM supply, contractor replacement programs or multi-element RO skid changeouts, contact Crystwater with your required quantity, delivery postcode and project timing.

Bulk pricing and freight options may be available for multiple membrane orders.

For urgent replacement or project supply, please confirm stock availability and freight before ordering.

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