ESPA1-4040 Ultra Low Pressure Brackish RO Element | RO membrane 4040 For Pure Water

ESPA1-4040 Ultra Low Pressure Brackish RO Element | RO membrane 4040 For Pure Water

Product Introduction

Complete liquid filter and full-series spiral wound reverse osmosis elements are our core industrial water treatment product lines, and we provide high-performance RO membrane 4040 solutions for commercial and industrial pure water projects — the ESPA1-4040 ultra low pressure brackish RO element. As a classic energy-saving 4-inch RO membrane, ESPA1-4040 is built with composite polyamide thin-film composite material, featuring ultra-low operating pressure and stable 99.3% nominal salt rejection, minimum guaranteed 99.0% rejection rate. Different from traditional high-pressure brackish RO membranes that consume massive electricity, this RO membrane 4040 model cuts system energy consumption significantly without sacrificing water purification efficiency. It is standard 4040 size (4 inch × 40 inch), perfectly compatible with all mainstream 4-inch RO membrane housings for plug-and-play replacement. Widely adopted for drinking water, commercial pure water, light industrial process water and wastewater reuse, ESPA1-4040 is the preferred RO membrane 4040 for users who prioritize energy saving and stable pure water output. For heavy organic wastewater scenarios, we offer anti-fouling LFC series RO elements as matching alternatives.

Working Principle

ESPA1-4040 adopts standard spiral wound thin-film composite solution-diffusion separation technology, with exclusive ultra-low pressure structural optimization to stand out among other RO membrane 4040 products:

1.Hydrophilic composite polyamide active layer

The specially grafted hydrophilic polyamide coating reduces water penetration resistance, allowing pure water to pass through the membrane layer under much lower hydraulic pressure. Under working pressure, water molecules selectively permeate the membrane, while salts, bacteria, viruses, suspended solids and heavy metal ions are intercepted via molecular screening and electrostatic repulsion, producing clean pure water. The dense polyamide layer also resists mild organic adhesion and chemical erosion during regular cleaning cycles.

2.Low-resistance spiral wound feed spacer design

Corrugated thin feed spacers reduce internal flow friction and lower system pressure loss, which is the core reason for its ultra-low energy consumption. The spiral winding structure maximizes effective membrane area up to 85 sq.ft (7.9 ㎡), ensuring sufficient permeate flow of 2600 gpd under standard test conditions. The turbulent flow formed by spacers also alleviates concentration polarization, slowing membrane fouling and extending service intervals between cleaning.

Unified cleaning parameters: continuous operation pH 2.0–10.0, cleaning pH range 1–12, maximum cleaning temperature 45°C, single cleaning cycle limited within 2 hours. After standard acid & alkali CIP cleaning, ESPA1-4040 can restore over 90% of original permeate flux and maintain stable salt rejection. Actual service life depends on feed water SDI value, pretreatment effect and daily maintenance frequency.

Core Technical Parameters

Basic Performance

• Model: ESPA1-4040 Ultra Low Pressure Brackish RO Element

• Permeate Flow: 2600 gpd (9.8 ㎡/d)

• Nominal Salt Rejection: 99.3%, Minimum Guaranteed Rejection: 99.0%

• Configuration: Spiral Wound

• Membrane Polymer: Composite Polyamide

• Effective Membrane Area: 85 sq.ft (7.9 ㎡)

Application Operating Data

• Maximum Applied Pressure: 600 psig (4.16 MPa)

• Maximum Chlorine Concentration: <0.1 PPM

• Maximum Operating Temperature: 113 ℉ (45 °C)

• Continuous Operating pH Range: 2.0–10.0

• Cleaning pH Range: 1–12

• Maximum Feed Water Turbidity: 1.0 NTU

• Maximum Feed Water SDI (15 mins): 5

• Minimum Feed Flow: 16 GPM (3.6 ㎥/h)

• Maximum Concentrate to Permeate Ratio: 5:1

• Maximum Pressure Drop Per Element: 10 psi

Dimensional Standard

Standard RO membrane 4040 specification: 4 inch outer diameter × 40 inch total length, compatible with all universal 4-inch membrane housings.

Feed Water Operating Envelope

ESPA1-4040 applies to brackish water with TDS ≤5000 ppm. All free chlorine must be fully neutralized upstream to avoid irreversible oxidation damage to polyamide layer. If raw water SDI exceeds 5, multimedia filtration pretreatment is mandatory to reduce membrane fouling risk and stabilize long-term performance of this RO membrane 4040.

Product Advantages

1.Ultra Low Pressure & Outstanding Energy Saving

Compared with conventional brackish RO membrane 4040, ESPA1-4040 requires far lower operating pressure, greatly cutting high-pressure pump power consumption and daily electricity expenditure for commercial pure water stations. This energy-saving feature reduces overall operation cost for long-term running systems.

2.High Efficient Filtration & Stable High Salt Rejection

Effectively removes dissolved salts, bacteria, viruses, colloids and suspended particles from raw water, outputting clean, pure qualified water. Stable 99.3% salt rejection ensures consistent permeate water quality all year round.

3.Eco-Friendly Water Treatment Solution

The RO separation process barely needs chemical additives during normal operation, lowering chemical discharge and environmental pollution, complying with global green water treatment standards.

4.High Reliability & Long Service Life

Industrial-grade reinforced winding structure is designed for continuous long-cycle operation. Wide cleaning pH tolerance and anti-fouling spacer design extend service life and reduce annual membrane replacement frequency of RO membrane 4040.

5.Flexible Modular System Matching

As standard 4040 size element, ESPA1-4040 supports flexible modular combination, easily matching small commercial water dispensers, medium factory pure water lines and municipal small-scale reuse projects of different production capacities.

6.Universal Plug-and-Play Replacement

Standard 4-inch 4040 overall dimension, end cap and central tube structure fit all mainstream brand 4040 membrane housings. No equipment reconstruction work needed during old system membrane upgrade, saving transformation labor cost.

Application Fields

Suitable Scenarios

• Commercial pure water equipment, office drinking water stations, bottled water small production lines

• Light industrial process water: food, beverage, cosmetic, electronics factory pure water preparation

• Municipal surface water, well water brackish water purification treatment

• Low-concentration industrial wastewater secondary reuse projects

• Small-scale water treatment plant old RO system membrane replacement & upgrade

Unsuitable Working Conditions

• Full-strength seawater desalination (TDS over 10,000 ppm; select dedicated SWC series seawater RO membrane 4040/8040)

• High organic heavy industrial wastewater with sustained high COD without advanced activated carbon pretreatment

• Systems with persistent unneutralized free chlorine inflow

• Projects requiring ultra-high boron removal standard (choose high-rejection CPA or SWC series RO elements)

Quality Standards

Every batch of ESPA1-4040 RO membrane 4040 undergoes full simulated brackish water performance testing before shipment, with serialized batch inspection records tracking permeate flow, salt rejection, pressure drop and post-cleaning recovery data for full traceability. Our whole production system complies with ISO 9001:2015 quality management system, and core separation performance indicators pass independent third-party water treatment laboratory verification.

Three strict inspection links guarantee consistent quality of each RO membrane 4040: incoming raw material testing, semi-finished product recheck and finished product full performance detection. All wetted contact polymer materials meet international industrial water safety standards, complete test reports and certification files can be provided for global tender bidding and factory acceptance inspection. Finished ESPA1-4040 elements are vacuum sealed with special anti-desiccation preservation liquid to prevent polyamide layer dry cracking during long-distance sea freight and long-term storage.

Future Prospect

Our R&D team will continue to optimize the hydrophilic polyamide coating formula and low-resistance spacer geometry of ESPA1-4040, further reducing required operating pressure while maintaining stable high salt rejection. All upgraded versions will retain standard 4040 dimensional interchangeability to fully protect customers’ existing membrane housing investment.

We will expand mass production capacity of this hot-selling RO membrane 4040 model to shorten bulk order delivery cycles, launch customized OEM packaging and mixed container loading service together with other 4040 series RO elements. With rising global demand for energy-saving commercial pure water treatment equipment, ultra-low pressure ESPA1-4040 will occupy larger market share, and we will keep optimizing production cost control to maintain competitive factory prices for long-term cooperative distributors and EPC contractors.

Summary

ESPA1-4040 ultra low pressure brackish RO element is a classic energy-saving RO membrane 4040 for commercial and industrial pure water production, with core strengths of ultra-low operating pressure, stable 99.3% high salt rejection, standard universal 4040 size and flexible modular collocation. Compared with ordinary high-pressure brackish RO membrane 4040, it effectively cuts system energy consumption and long-term operation maintenance cost, while efficiently removing salts, bacteria and impurities to produce qualified pure water.

For commercial water station operators, light industrial factory managers, water treatment EPC contractors and global distributors looking for cost-effective energy-saving RO membrane 4040, ESPA1-4040 is an ideal plug-and-play replacement solution. Submit your raw water quality report now to get customized bulk quotation, complete technical datasheet and free professional water system design consultation service.

FAQ

Q1: What makes ESPA1-4040 different from other common RO membrane 4040 models?

A1: ESPA1-4040 is an ultra-low pressure brackish RO membrane 4040. Its hydrophilic polyamide layer and low-resistance spacers greatly reduce system operating pressure, cutting power consumption far more than traditional high-pressure RO membrane 4040, while keeping stable 99.3% salt rejection for pure water production.

Q2: Can ESPA1-4040 directly replace other brand 4040 RO membranes in existing housings?

A2: Yes, it adopts standard 4-inch × 40-inch 4040 overall dimension, end cap and flow channel design, fully interchangeable with all mainstream brand 4040 membrane housings. Only minor high-pressure pump pressure fine-tuning after installation can restore rated permeate flow.

Q3: What pretreatment is required to extend ESPA1-4040 service life?

A3: Feed water SDI must be controlled ≤5 via multimedia filtration; all free chlorine must be fully neutralized upstream. Daily continuous operating pH should be kept between 2–10, and regular acid & alkali CIP cleaning cycles are required. Submit full lab water analysis report for custom anti-scalant dosing suggestions for high-hardness well water.

Q4: What water treatment scenarios is ESPA1-4040 most suitable for?

A4: It is specially designed for brackish water pure water projects, including commercial drinking water stations, food & electronics factory process water, small municipal well water purification and low-concentration wastewater reuse systems.

Q5: Is ESPA1-4040 applicable for seawater desalination?

A5: No, this is brackish water ultra-low pressure RO membrane 4040 only for feed TDS ≤5000 ppm. For full-salinity seawater desalination, please select our SWC series dedicated seawater RO membrane elements.

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