Dow membrane filters SW30HRLE-400 is a high-performance seawater RO membrane for large-scale desalination, paired with pre-treatment filter cartridges and ultrafiltration systems. A liquid filter acts as the frontline barrier to capture suspended solids and protect the RO membrane from abrasive damage. Our [Pentair ALN05-60B Filter Cartridge is widely adopted in the prefiltration loop, lowering feedwater SDI and extending the service life of SW30HRLE-400 for coastal desalination projects.
Dow SW30HRLE-400 Membrane & UF Pre-filtration System
Dow membrane filters SW30HRLE-400is a high-performance seawater RO membrane for large-scale desalination, paired with pre-treatment filter cartridges and ultrafiltration systems. A liquid filter acts as the frontline barrier to capture suspended solids and protect the RO membrane from abrasive damage. Our Pentair ALN05-60B Filter Cartridge is widely adopted in the prefiltration loop, lowering feedwater SDI and extending the service life of SW30HRLE-400 for coastal desalination projects.
Dow membrane filters SW30HRLE-400 is a premium seawater reverse osmosis membrane element designed for demanding high-salinity seawater desalination and brine concentration applications. Featuring a high salt rejection polyamide thin-film composite structure, this membrane efficiently separates dissolved salts, colloids, organic contaminants and fine particulates from raw seawater, delivering stable fresh water output for municipal drinking water and industrial process water.
The long-term performance of Dow membrane filters SW30HRLE-400 heavily depends on a complete pre-treatment chain, which normally includes ultrafiltration equipment and high flow filter cartridges. Raw seawater contains silt, sand, marine organisms and suspended particles that can scratch the membrane surface and trigger irreversible fouling. That is why the ultrafiltration system and downstream HFU640UY045H high flow filter cartridge are essential to safeguard the RO membrane. The ultrafiltration unit removes large colloids and microbes, while the high flow filter cartridge intercepts residual particulate contaminants before the water enters the SW30HRLE-400 membrane element.
Compared with standard small-size filter cartridges, high flow filter cartridges adopt pleated deep filter media structure, supporting much higher liquid throughput with low pressure drop. Besides HFU640UY045H high flow filter cartridge, we also provide alternative options such as Pall HFU 660GFO20H Ultipleat filter and Replace Parker High Flow Water Filter for UF Pretreatment System for different seawater desalination project scales. These liquid filter elements reduce the load of the downstream RO membrane, cut down chemical cleaning frequency and help users save operation cost for Dow membrane filters SW30HRLE-400.
Many seawater desalination plants choose to install ultrafiltration as the core pre-treatment unit. The ultrafiltration membrane module also needs protective filtration. Our HFU640J200H high flow filter cartridge can be installed before the ultrafiltration system to block coarse sediment and large debris, preventing physical damage to the UF membrane. The combined solution of coarse filtration → ultrafiltration → high flow cartridge prefiltration creates multi-stage protection for Dow membrane filters SW30HRLE-400, ensuring the feed water SDI value stays within the required range.
The integrated water treatment system built around Dow membrane filters SW30HRLE-400 runs through three key stages: coarse prefiltration, ultrafiltration, and reverse osmosis separation.
At the first stage, raw seawater flows into filter housings loaded with PFTM12UEPFC high flow filter cartridge. This gradient pleated filter uses large pores on the outer layer to trap big sediment and plankton, while fine inner pores capture tiny suspended particles. This gradient design avoids rapid surface clogging and maintains stable flow for long continuous operation.
After coarse filtration, seawater enters the ultrafiltration equipment. The UF membrane removes colloids, bacteria and macromolecular organic matter, greatly lowering the SDI and turbidity of the feed water. After ultrafiltration, the water passes through the final safety filter, commonly Pentair AL-6-60B Filter Cartridge. This step catches any UF membrane fragments or residual fine particles, forming the last protective barrier before the RO membrane.
Then the qualified low-SDI seawater is pumped into Dow membrane filters SW30HRLE-400 under high operating pressure. Water molecules penetrate the polyamide composite membrane, while salt ions, heavy metals and leftover colloids are retained on the membrane surface. Fresh permeate water is collected as product water, and concentrated brine is discharged separately.
Without this multi-stage pre-treatment, solid particles will abrade the RO membrane surface and cause permanent fouling. Once irreversible fouling occurs, the salt rejection performance of Dow membrane filters SW30HRLE-400 will drop sharply, and the membrane must be replaced prematurely. Therefore, selecting matched high flow filter cartridges is critical for stable long-term operation of the whole seawater desalination system.
| Item | Specification |
|---|---|
| Model | SW30HRLE-400 |
| Membrane Category | Seawater Reverse Osmosis Membrane Element |
| Active Membrane Area | 400 sq ft |
| Typical Salt Rejection | 99.7% |
| Max Operating Pressure | 1200 psi |
| Max Operating Temperature | 45℃ |
| Operating pH Range | 2.0 ~ 11.0 |
| Required Feed Water SDI | ≤3 |
| Recommended Final Prefilter | 5μm high flow filter cartridge |
To keep inlet SDI below 3, we recommend PFTM11UNPFA high flow filter cartridge as the final safety filter before the SW30HRLE-400 membrane. This filter cartridge delivers consistent filtration precision and high dirt holding capacity, perfectly meeting the strict inlet water requirement of Dow membrane filters SW30HRLE-400.
All supporting high flow filter cartridges for Dow SW30HRLE-400 seawater RO membrane are manufactured under ISO 9001 quality management system. Every batch of filter media undergoes bubble point test, pressure resistance test and dirt holding capacity inspection before delivery.
We use high-quality polypropylene filter media for most of our high flow cartridges, which features excellent chemical compatibility with seawater, acid and alkaline cleaning chemicals. Each finished filter element will be inspected for end cap sealing integrity, to prevent liquid bypass that could damage the SW30HRLE-400 membrane.
Our factory also supports custom filter cartridges for special project requirements. Whether you need standard replacement elements or customized prefiltration filters, we can provide stable, cost-effective products for seawater desalination and ultrafiltration projects.
Dow membrane filters SW30HRLE-400 is widely used in various high-salinity water treatment scenarios:
Coastal seawater desalination plants for municipal drinking water supply
Power plant boiler makeup water production via seawater desalination
High-salinity industrial brine concentration and recycling
Offshore platform seawater desalination system
Aquaculture seawater purification and reuse
For all these projects, prefiltration using high flow filter cartridges is mandatory. Our full portfolio of filter elements, including HFU series, PFTM series and Pentair replacement cartridges, can be matched with different capacity seawater desalination and ultrafiltration systems. The selection of pre-filtration cartridges for Dow membrane filters SW30HRLE-400 depends on raw seawater turbidity, salinity and system design. Higher filtration precision will reduce the maximum flow rate, so we balance flow capacity and particle retention efficiency for each seawater desalination project. Our Equivalent Pall Filter HFU660GF060H13 follows the same technical specifications and can directly replace original filter elements without modifying existing filter housings.
A1: SW30HRLE-400 is a seawater reverse osmosis membrane element. It removes dissolved salt from seawater to produce fresh water, and it requires prefiltration with high flow filter cartridges and ultrafiltration equipment to reduce feed water SDI.
A2: Raw seawater contains sediment, plankton and colloids. Ultrafiltration removes colloids and microbes, while high flow filter cartridge captures residual particles. Combined pre-treatment prevents membrane scratching and fouling for Dow membrane filters SW30HRLE-400.
A3: 5 micron high flow filter cartridge is the standard selection. Our Pentair ALN05-60B Filter Cartridge with 5μm precision is the most popular choice for seawater RO prefiltration.
A4: Normally 2~6 months, which depends on raw seawater water quality. Replace the cartridge once the pressure drop across the filter housing exceeds the preset threshold.
A5: Absolutely yes. Ultrafiltration is commonly installed before the final safety filter. It reduces colloids and organic pollutants, providing better feed water condition and protecting the SW30HRLE-400 RO membrane.
A6: Yes. We manufacture replacement high flow filter cartridges for Pall HFU series, Pentair AL series and Parker filters, compatible with seawater desalination prefiltration systems for Dow membrane filters SW30HRLE-400.
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