SW30HRI-400/34i High Efficiency High Rejection Seawater RO Element | Buy RO membrane Wholesale

SW30HRI-400/34i High Efficiency High Rejection Seawater RO Element | Buy RO membrane Wholesale

Product Introduction

As a professional manufacturer supplying complete industrial Liquid Filters and a reliable supplier for clients who want to buy RO membrane wholesale, we produce full ranges of spiral-wound reverse osmosis elements covering brackish, anti-fouling and seawater desalination categories. The SW30HRI series is a high-efficiency and high-performance seawater RO line, and SW30HRI-400/34i serves as the mainstream 4-inch element built for conventional full-strength standard seawater desalination projects.

Many generic seawater RO elements cannot balance energy consumption and stable salt rejection. Low-cost marine grades often suffer obvious flux attenuation under long-term continuous high-pressure operation with 32,000 ppm standard seawater. The SW30HRI-400/34i adopts optimized high-crosslink polyamide separation layers and low-flow-resistance pressure-resistant spacers to maintain consistent ultra-high salt rejection while cutting overall system power consumption. With standard 400/34i dimensional sizing matching mainstream SW30HRI series seawater pressure vessels, the element supports straightforward retrofit replacement without vessel reconstruction or high-pressure pump parameter recalibration during routine plant maintenance cycles. It is widely applied for small coastal municipal desalination, island fresh water supply, offshore platform compact water production and general industrial marine salt water treatment projects with standard seawater quality profiles.

For low-energy brackish water treatment with mild feed quality, our ESPA2-8040 universal RO element provides a cost-effective alternative. For organic-laden wastewater requiring anti-fouling performance, the LFC3-8040 hydrophilic low-fouling series delivers targeted organic repellency. The SW30HRI-400/34i is purpose-built for standard full-strength seawater desalination workloads, prioritizing steady high salt rejection and energy-saving operation under continuous high-pressure marine feed, without specialized anti-fouling optimization for heavy organic wastewater.

Working Principle of High Efficiency High Rejection Seawater RO Membrane

All commercial polyamide seawater reverse osmosis membranes operate on the established solution-diffusion mechanism. Under calibrated high operating pressure exclusive for marine feed, water molecules penetrate the dense cross-linked polyamide active layer, while high-concentration sodium chloride ions and trace dissolved inorganic pollutants are intercepted via molecular exclusion and surface electrostatic repulsion to generate low-TDS compliant fresh permeate.

Two targeted structural optimizations distinguish the SW30HRI-400/34i from generic aftermarket seawater RO elements:

High-crosslink-density polyamide formulation delivers consistent elevated salt rejection under continuous high-pressure seawater operation, maintaining stable separation efficiency amid long-term marine feed exposure. The polymer matrix is tuned to withstand sustained high hydraulic load without premature structural degradation.

Low-resistance corrugated feed spacers balance sufficient cross-flow scouring and structural stability under seawater system pressure ranges, mitigating concentration polarization under standard recovery ratios and slowing mild inorganic fouling accumulation in conventional marine feed streams.

After standardized neutralization, acid and alkaline cleaning cycles executed per industry standard parameters (pH 1–13, cleaning temperature ≤35°C, single cycle duration ≤2 hours), this element delivers steady performance recovery aligned with mainstream commercial seawater RO benchmarks. Flux typically recovers to 90–93% of nominal factory value, while salt rejection recovery remains above 98% of the rated standard. Actual on-site performance varies based on feedwater TDS concentration, pretreatment efficiency and routine maintenance frequency.

Core Standard Technical Parameters

All certified metrics follow mainstream seawater membrane industry test specifications, with uniform 400/34i dimensional sizing compatible with standard SW30HRI series seawater pressure vessels for seamless field replacement:

Product Positioning: 400/34i spiral-wound seawater RO element for wholesale buyers who buy RO membrane, high efficiency high salt rejection grade optimized for full-strength standard marine feedwater

Standard Test Condition: 25°C, 800 psi, 32,000 ppm NaCl simulated seawater, 8% recovery

Stabilized Salt Rejection Rate: ≥99.7% (factory nominal value; minimum guaranteed ≥99.5% within rated operating window)

Nominal Permeate Flux: 6,200–6,600 GPD (±5% manufacturing tolerance band centered on 6,400 GPD nominal value). For seawater feed with elevated mineral or particulate load, system design should target flux derated 10–15% from nominal rating to extend stable service life. Full site-specific flux guidance is available upon submitting complete feedwater lab analysis reports to our engineering team.

Recommended Seawater Operating Pressure Window: 700–900 psi; 700 psi is the minimum recommended inlet pressure for stable rejection performance with standard 32,000 ppm seawater feed at 25°C; operation below 700 psi will significantly reduce salt rejection and elevate permeate TDS

Maximum Long-Term Continuous Operating Temperature: 40°C

Short-Term Peak Tolerance Temperature (emergency exposure only, maximum 2-hour cumulative duration): 45°C

Continuous Operating pH Range: 2.0–10.0; standard chemical tolerance suited for routine marine feed pH fluctuations

Short-Term Chemical Cleaning pH Limit: 1.0–13.0 (limited to 2-hour single cycles, temperature ≤35°C)

Maximum Allowable Feed Water SDI: ≤3

Single Element Pressure Drop: ≤13 psig. Design priority was given to low-resistance wide-channel turbulence spacers to reduce pumping energy and suppress inorganic fouling under high-salinity feed conditions; operators should account for this pressure drop in standard array hydraulic calculations to ensure balanced flow distribution.

Active Membrane Area: 340 sq. ft.

Defined Feedwater Operating Envelope

SW30HRI-400/34i is designed for seawater feed streams meeting these fixed baseline parameters: TDS 30,000–35,000 ppm, sustained operating pH 2–10, COD ≤40 mg/L, SDI ≤3, and zero continuous free chlorine exposure. For feedwater falling outside these thresholds, submit full lab analysis to our engineering team for customized operating guidance.

Core Product Advantages

Featuring high-crosslink-density balanced polyamide construction paired with low-flow-loss spacer layout, the SW30HRI-400/34i maintains steady ultra-high salt rejection under continuous high seawater operating pressure while cutting daily pumping power consumption, reducing unplanned performance attenuation and routine maintenance frequency for coastal desalination facilities without compromising daily fresh water yield quality. This energy-saving structural design makes the membrane highly adaptable to standard full-strength marine feedwater with consistent high salinity profiles, minimizing gradual performance decay and supporting long uniform service cycles across compact coastal desalination treatment scenarios.

The membrane features full dimensional and structural consistency with original SW30HRI series seawater elements, enabling complete zero-modification retrofit compatibility; on-site element replacement can be finished during routine equipment shutdowns without vessel adjustment, pipeline transformation or high-pressure pump recalibration, greatly lowering project retrofit investment and daily labor maintenance costs. Verified by widespread small coastal municipal and offshore compact industrial field application data, the SW30HRI-400/34i maintains steady routine chemical cleaning intervals aligned with standard seawater membrane benchmarks under matched low-fouling marine feed conditions, delivering consistent long-term operational stability for standard coastal salt water sources.

Additionally, the element delivers reliable and stable performance recovery after standardized chemical maintenance, with both flux and salt rejection restoring to high rated levels, avoiding the rapid performance degradation common in low-cost generic seawater membranes after repeated cleaning cycles. This consistent post-cleaning stability sustains long-term system fresh water yield efficiency and effectively reduces annual membrane replacement frequency for small-scale coastal seawater desalination plants. We support flexible wholesale cooperation for clients who buy RO membrane in bulk, with unified export packaging and batch discount policies to meet the procurement demands of global distributors and EPC contractors.

Application Scope & Clear Limitations

Suitable deployment scenarios within the above operating boundaries:

Small coastal municipal seawater desalination plant retrofits, remote island compact fresh water supply projects, offshore oil & gas platform mini fresh water production stations, general industrial marine water purification projects targeting basic fresh water production with low organic fouling feed sources.

Explicit Non-Suitable Operating Scenarios

Low-salinity brackish water treatment with TDS below 10,000 ppm: Select our dedicated brackish RO membrane series

Facilities with regulated strict boron removal requirements for potable permeate: Adopt our specialized boron-rejection seawater RO line

Complex industrial wastewater streams with high COD, heavy metal or extreme hardness loads: Choose LFC or PROC specialty brackish series

Systems with sustained feed pH exceeding 10 or recurring unneutralized free chlorine exposure

Raw feed intake with consistent SDI >3 without effective multimedia filtration or activated carbon pretreatment

Continuous operation above maximum recommended recovery limits matched to full feed contaminant analysis

For small coastal desalination EPC engineers and plant O&M managers, full datasheets include temperature correction coefficients, recovery vs fouling risk performance curves and active membrane area sizing data to support accurate membrane array replacement planning, high-pressure pump load calibration and pretreatment maintenance scheduling for low-disruption standard seawater desalination plant retrofits.

Quality Control Standards

All SW30HRI-400/34i standard seawater wholesale RO membrane batches undergo full simulated full-strength seawater feed performance testing prior to shipment, with serialized inspection records documenting salt rejection, nominal flux, pressure drop and post-cleaning recovery metrics. The complete in-house manufacturing workflow complies with ISO 9001:2015 quality management certification; certification documentation, audit reports and serial batch traceability logs are available upon formal project tender request. All wetted construction materials meet industrial seawater treatment material safety criteria, and core elevated salt rejection and energy-saving structural stability performance metrics have passed third-party performance testing by an independent water treatment testing laboratory; laboratory test reports and certification identification numbers can be provided for bid documentation and plant acceptance review.

Full technical datasheets supplied with each wholesale shipment include dimensional compatibility schematics for standard SW30HRI series seawater pressure vessels, temperature correction coefficient tables, standard seawater feed fouling risk guidelines, standardized chemical cleaning operational protocols and full batch traceability records for tender filing, retrofit engineering design and plant acceptance inspection. Finished membrane elements are vacuum sealed with proprietary anti-desiccation preservation liquid to prevent separation layer degradation during transit and storage, preserving factory-calibrated flux and rejection performance when installed within qualified pretreatment operating boundaries. Customized packaging and bulk wholesale discount plans are offered for global clients who buy RO membrane in large quantities.

Future Development Prospect

Internal R&D engineering teams continue iterative refinement of high-crosslink-density polyamide separation layer formulations and low-resistance turbulence feed spacer geometry for the SW30HRI seawater replacement membrane line. Current development targets a further 4–6% reduction in required design operating pressure while retaining the existing ≥99.7% nominal salt rejection rating and competitive wholesale pricing structure. Field trial prototype samples will be available for qualified small coastal seawater desalination retrofit project partners prior to scheduled 2027 product iteration launch. All updated iterations will retain full dimensional interchangeability with standard SW30HRI series 400/34i seawater RO pressure vessel hardware to ensure consistent retrofit adaptability for established compact desalination plant operators.

Summary

This industrial spiral-wound high efficiency high rejection seawater RO membrane model SW30HRI-400/34i is manufactured in our in-house ISO 9001 certified production facility, engineered around three core design attributes: full dimensional match for standard SW30HRI series 400/34i seawater RO hardware, high-crosslink-density polyamide chemistry for steady ultra-high salt rejection under continuous high-pressure full-strength seawater feed streams, and low-resistance wide-channel feed spacers to cut maintenance and pumping costs for compact marine desalination workloads. It supports flexible bulk wholesale cooperation for clients who want to buy RO membrane wholesale, with standardized export packaging to simplify global project delivery.

It is developed exclusively for standard compact coastal seawater desalination retrofit projects that maintain continuous raw feed temperatures of 15–40°C and prioritize consistent contaminant removal alongside energy-saving operation for long-term high-pressure marine workloads. Delivering tight flux manufacturing tolerances and stable long-term high-pressure operational performance under matched mild pretreatment conditions, the SW30HRI-400/34i provides cost-effective, energy-saving interchangeable hardware as an alternative to generic standard aftermarket seawater RO membrane products. Tailored for small-scale coastal seawater desalination retrofit projects without complex industrial wastewater or ultra-low boron removal constraints, it offers competitive unit wholesale pricing and predictable long-term maintenance overheads for municipal coastal mini-desalination retrofits, offshore platform fresh water stations and remote island water supply facilities. For compact coastal desalination EPC contractors, plant O&M teams and water treatment design firms seeking interchangeable energy-efficient seawater RO elements optimized for steady high salt rejection within defined marine feed operating limits, this model for wholesale buyers who buy RO membrane delivers a viable, cost-efficient standardized aftermarket solution.

FAQ

Q1: What key differentiators separate SW30HRI-400/34i from generic economy-grade aftermarket seawater RO replacement membranes?

A1: The SW30HRI-400/34i features full dimensional matching for standard SW30HRI series 4-inch seawater pressure vessels to eliminate costly system modification work. It adopts a tight ±5% nominal flux manufacturing tolerance band paired with high-crosslink-density polyamide chemistry built to withstand long-term high seawater operating pressure while maintaining consistent ultra-high salt rejection for standard marine feedwater. Under identical compliant pretreatment conditions, it delivers stable post-cleaning performance recovery that avoids steady output decay common in low-cost generic seawater membranes with weaker cross-link structure. We also provide favorable bulk wholesale prices for clients who buy RO membrane in large orders.

Q2: Can SW30HRI-400/34i be installed as a direct swap for original SW30HRI series seawater RO elements without permanent equipment modifications?

A2: Yes, all external dimensions, end cap structure and feed spacer sizing are fully matched to mainstream standard SW30HRI series 400/34i seawater RO pressure vessels. Minor temporary operating pressure fine-tuning post-installation restores nominal flux and salt rejection performance; temperature correction coefficients included in the full datasheet must be integrated into engineering design calculations for seasonal cold coastal seawater intake. When sizing arrays for feed with slightly elevated mineral or organic load, derate nominal flux by 10–15% to maximize service life and consistent rejection stability.

Q3: What pretreatment and operating parameters are mandatory to maintain rated high-pressure high-rejection performance?

A3: Feedwater SDI must be sustained below 3 via multimedia filtration; all free chlorine must be fully neutralized upstream. Continuous operating temperature must remain within 15–40°C, with cumulative emergency 45°C exposure capped at 2 hours total per cleaning cycle. Continuous operating pH must be held between 2–10 to avoid accelerated polyamide hydrolysis and permanent performance degradation. For feeds with elevated silica, barium, strontium or heavy organic load, submit complete lab water analysis for custom recovery and chemical dosing guidance from our engineering team.

Q4: Is SW30HRI-400/34i suitable for brackish low-salinity water or industrial mixed contaminated wastewater?

A4: This high-efficiency seawater RO element is optimized for full-strength marine salt water desalination with TDS 30,000–35,000 ppm, without molecular modification for low-salinity brackish feed or tolerance for high-COD industrial mixed effluent streams. For facilities handling brackish water or complex polluted wastewater, our dedicated brackish and specialty anti-fouling RO series are the appropriate alternative selections.

Other products you may want to know about

CPA3-LD RO Hydranautics Membrane

SWC5-LD Hydranautics SWC5-LD RO Membrane Seawater 

ESPA1-4040 Seawater Membrane Reverse Osmosis