Product description
2.5 inch reverse osmosis membrane for commercial and industrial water purification
The 2.5″ Reverse Osmosis Membrane (2540 format) is engineered for compact yet high-performance water purification systems. With a nominal diameter of 2.5 inches and a length of 40 inches, this membrane element is widely used in commercial, industrial and specialised process applications where reliable dissolved solids removal, stable permeate quality and efficient operation are essential.
These membranes are compatible with standard 2.5″ × 40″ pressure vessels and are suitable for new system designs, replacements and retrofit projects.
Filtration principle
Reverse osmosis membranes utilise a semi-permeable thin film composite (TFC) structure. When feed water is pressurised against the membrane surface, water molecules pass through while dissolved salts and many contaminants are rejected. The result is:
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effective removal of dissolved solids
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high-quality permeate production
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consistent performance over long service life
This makes reverse osmosis a reliable core technology for water purification across applications.
Membrane construction
2.5″ RO membranes supplied by Filtra International are manufactured using advanced thin film composite construction, which typically includes:
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a selective polyamide thin film composite membrane layer
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internal support structures for mechanical integrity
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feed spacer to optimise flow distribution
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permeate collection layers with low pressure loss
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protective outer wrap for membrane stability
This spiral-wound design ensures robust performance under continuous duty.
Performance characteristics
2.5″ RO membranes are available in multiple performance categories tailored for different feed conditions and system objectives:
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Economic / High Production – Designed to deliver higher permeate flow at moderate operating pressures while maintaining good salt rejection performance, ideal for general brackish water applications. Average rejection rates in this category are typically around 99% under standard test conditions.
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Standard / Balanced Performance – Offers a balance of permeate flow and rejection suitable for a wide range of commercial and industrial brackish water feeds.
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High Rejection / Industrial Quality – Engineered for higher dissolved solids rejection, optimised for tougher feed water with elevated TDS or where higher permeate quality is required.
Each range can be offered in slightly different material or manufacturing specifications to suit system design priorities.
Operating conditions
Typical operational considerations for 2.5″ RO membranes include:
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suitable for brackish and low salinity feed waters
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operating pressures adjusted for the selected performance category
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stable performance across standard water treatment pH ranges
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suitable for continuous industrial or commercial use
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operating temperature range consistent with common RO service environments (typically up to around 45°C)
Exact limits depend on membrane category and specific system design.
Standard dimensions
2.5″ RO membranes are manufactured to standard industry dimensions:
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Nominal diameter: 2.5 inches
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Nominal length: 40 inches
These dimensions ensure compatibility with standard 2.5″ RO pressure vessels and housings used in commercial and industrial systems.
Typical applications
2.5″ RO membranes are widely used in:
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commercial water purification systems
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industrial process water treatment
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food and beverage water systems
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boiler feed water pre-treatment
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wastewater reuse and recovery
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desalination pretreatment
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laboratories and technical water systems
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specialised commercial applications requiring compact RO elements
Their compact size makes them particularly suitable where space efficiency is necessary.
Key benefits
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Compact, industry standard 2.5″ × 40″ format
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Reliable salt rejection performance
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Options for high flow or high rejection performance
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Compatible with standard 2.5″ RO housings
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Designed for continuous industrial and commercial duty
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Supports efficient system design and retrofit solutions
Configuration and quotation
2.5″ RO membranes are supplied based on system design and water quality requirements. Selection parameters include:
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membrane performance category
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feed water quality and TDS level
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desired permeate quality and recovery rate
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operating pressure and temperature
Filtra International provides expert support to ensure the correct membrane choice for each application.