TMH Series Ultra Low Energy Brackish Water RO Membrane

TMH Series Ultra Low Energy Brackish Water RO Membrane

Traditional medium-pressure brackish RO membranes such as the TMG series have long been widely used in conventional water treatment projects, yet they carry an obvious operational drawback: high continuous operating pressure leads to massive power consumption throughout long-term service. For water treatment operators and engineering contractors located in regions with high electricity tariffs, monthly pump power bills become an unavoidable heavy expenditure. Meanwhile, many cheap generic low-pressure reverse osmosis elements on the market cut operating pressure at the cost of desalination performance. Their salt rejection rate drops sharply when running at full flux, failing to meet strict purity standards required by municipal drinking water, food processing and electronic manufacturing production lines. This creates a persistent procurement dilemma for global buyers: there is a lack of cost-effective RO products that balance ultra-low energy consumption and stable high salt rejection.

Developed to solve this universal industry pain point, the TMH series ultra-low energy brackish water reverse osmosis membrane stands out as a professional energy-saving membrane solution specially designed for raw water with TDS below 1000ppm.  Every TMH membrane element undergoes comprehensive full-performance testing before leaving the factory, strictly complying with ISO 20466:2024 and NSF/ANSI 61 international manufacturing standards for safe contact with drinking water. With unified 4-inch and 8-inch standard outer dimensions, the TMH series can serve as a direct drop-in replacement for mainstream imported ULP membranes and domestic BW/TMG series elements without any pipeline or pressure vessel renovation. It has become a top-selling energy-saving RO product on Alibaba International Station, favored by global water treatment distributors, offshore solar water equipment suppliers and municipal engineering companies for its balanced performance and factory-direct competitive pricing.

1. Product Description

Global water treatment buyers face two core confusing choices when selecting brackish RO membranes, both of which bring hidden long-term project costs.

First, standard medium-pressure brackish RO membranes including the TMG product line demand relatively high steady working pressure. While they deliver balanced salt rejection and anti-fouling performance, the constant high load on high-pressure pumps results in continuous huge power expenses. For remote off-grid water systems relying on solar power and towns with expensive industrial electricity, such high energy loss significantly reduces the overall economic return of water treatment stations.

Second, mass-produced low-cost ultra-low pressure membranes sacrifice core separation performance to lower operating thresholds. Once these cheap elements run at rated water yield, their salt rejection value declines rapidly. Produced permeate cannot satisfy rigid purity rules for edible water, electronic cleaning liquid and boiler makeup water, forcing project owners to add secondary RO polishing equipment and raising total system investment.

The TMH series adopts cross-linked low-permeability aromatic polyamide membrane sheets as its core separation material, adopting proprietary interfacial polymerization modification technology that perfectly reconciles ultra-low operating pressure and stable desalination capacity. Under the standard test pressure of only 0.69MPa (100PSI), the membrane maintains a nominal salt rejection rate of no less than 99.3% with a guaranteed minimum rejection of 99.0%, eliminating the classic trade-off between low energy consumption and consistent water quality. Optimized 34mil biostatic wide flow channel spacers are integrated into the spiral-wound structure to mitigate concentration polarization under low-salinity raw water and inhibit mild organic and colloidal fouling.

This ultra-low energy RO model is exclusively tailored for light brackish water, tap water and surface water with total dissolved solids below 1000ppm. Its balanced design avoids redundant high-pressure structural costs while retaining reliable anti-scaling and anti-contamination properties. For all small, medium and large-scale water projects pursuing reduced long-term operational expenditure without compromising effluent standards, the TMH series acts as the optimal universal energy-saving membrane alternative, outperforming both medium-pressure conventional RO elements and inferior cheap low-flux membrane products in comprehensive economic benefits.

2. Technical Characteristics

Two complete universal specifications (TMH-4040 small size & TMH-8040 large size) are produced in full alignment with global industrial reverse osmosis benchmarks, fully compatible with all mainstream domestic and imported pressure vessels.

Core Desalination Index

Nominal salt rejection ≥99.3%; minimum guaranteed salt rejection ≥99.0%. The stable desalination standard meets global municipal drinking water and industrial pure water technical requirements under continuous low-pressure operation.

Standard Size Parameters

TMH-4040 

Dimension: 4-inch diameter × 40-inch length

Effective membrane area: 87 sq.ft (8.0 ㎡)

Standard rated permeate flow: 2400 GPD

TMH-8040 

Dimension: 8-inch diameter × 40-inch length

Effective membrane area: 400 sq.ft (37.2 ㎡)

Standard rated permeate flow: 11000 GPD

Operating Adaptation Parameters

Ultra-low standard test pressure: 0.69MPa (100PSI); maximum allowable long-term operating pressure: 4.1MPa

Applicable raw water temperature range: 5℃ to 45℃

Stable continuous operating pH window: 2.0–11.0

Chemical cleaning adaptable pH range: 1.0–13.0, supporting alternating acid and alkali circulation regeneration without damaging the polyamide separation layer

Strict Inlet Water Control Standards

Maximum allowable inlet SDI15 ≤5.0; maximum inlet residual chlorine concentration ≤0.1mg/L

This parameter fits standard municipal tap water and low-salinity underground well water. For raw water containing persistent oxidants and residual chlorine exceeding 0.1mg/L, our HSRO chlorine-resistant brackish RO series is strongly recommended to prevent irreversible membrane oxidation damage.

Flow Channel Structural Design

34mil thick biostatic wide feed spacers are applied throughout the membrane element. The widened water flow path eliminates internal dead zones, weakens concentration polarization effects unique to low-salinity raw water, and slows the adhesion of suspended colloids and microbial slime layers to extend service intervals between chemical cleaning cycles.

3. Core Product Advantages

All core strengths of the TMH series are converted into quantifiable economic benefits for project owners and end users.

Reduce long-term power consumption by 25%–35%

Compared with traditional medium-pressure brackish RO membranes such as TMG and BW30 lines, the TMH series operates under ultra-low 100PSI baseline pressure, greatly lowering the load on high-pressure pumps. Clients can select smaller-power pump equipment during system design to cut upfront mechanical procurement costs, while daily electricity bills for continuous water production drop significantly. This advantage makes the membrane particularly popular for solar off-grid water purification stations and projects built in areas with steep industrial electricity prices.

Balanced high flux and stable desalination without performance attenuation

Many budget low-pressure RO elements suffer obvious TDS rise in produced water once reaching full rated water output. Our cross-linked modified polyamide sheet maintains consistent separation efficiency at full flux, holding salt rejection above the guaranteed 99.0% threshold for years of continuous operation. Frequent system debugging caused by fluctuating permeate purity is eliminated, saving labor and reagent costs for routine water quality calibration.

Universal direct replacement with zero equipment renovation cost

Both TMH-4040 and TMH-8040 adopt industry-standard unified outer dimensions, fully interchangeable with original imported ULP membranes and domestic TMG, BW30 series elements. When carrying out old water treatment equipment upgrades, contractors can replace old membrane cartridges directly without modifying pipeline layouts, electrical control cabinets or pressure vessel fittings, drastically shortening project reconstruction construction periods and reducing auxiliary material expenditure.

Low maintenance frequency and simple field operation

Thanks to the optimized 34mil anti-fouling flow channel, the standard chemical cleaning cycle of TMH elements extends to 6–8 months under qualified inlet pretreatment (SDI ≤5.0). The wide 1.0–13.0 cleaning pH window allows alternating acid and alkali flushing to rapidly recover initial membrane flux after mild scaling and organic contamination. The maintenance workflow is straightforward and easy to master for overseas on-site field technicians without complex professional training.

Stable mass batch supply with consistent cross-border order performance

Mass production is completed inside our 100,000 ㎡ Class 100 dust-free sealed workshop, where every finished membrane element passes independent full testing covering flux, salt rejection, pressure resistance and anti-fouling stability before packaging. Batch-to-batch performance deviation is controlled within an extremely narrow range, avoiding inconsistent water output and purity for large cross-border bulk orders. Long-term stocking by global water distributors is fully supported with stable stock reserves and flexible bulk discount policies.

4. Comparative Advantage Chart Against Conventional Membrane Products

To help buyers make intuitive procurement judgments, we list the core drawbacks of mainstream competing membrane lines and the corresponding unique strengths of the TMH ultra-low energy series:

5. Wide Application Fields

As a best-selling energy-saving brackish RO product, the TMH series serves six major global mainstream low-salinity water treatment scenarios, clearly differentiated from chlorine-resistant HSRO, high-boron seawater TSE and compact small seawater SWC5 product lines.

Solar Off-Grid Water Purification Systems

Ideal for remote villages, pastoral areas and field exploration engineering equipment relying entirely on solar power. The ultra-low pump load lowers overall energy consumption of the whole water treatment skid, reducing solar panel configuration investment.

Municipal Tap Water Advanced Purification

Suitable for urban community centralized drinking water stations and small rural town water plants processing standard low-salinity municipal tap water without excessive residual oxidants. It stably produces domestic purified water that meets international potable water indexes.

Medium & Small Industrial Pre-Desalination

Matches food & beverage production process water, electronic component precision cleaning liquid and low-salinity boiler makeup water. The consistent low-pressure stable desalination avoids frequent water quality adjustments on industrial production lines.

Inland Light Brackish Underground Well Water Desalination

Perfect for rural safe drinking water projects in inland regions with raw water TDS controlled below 1000ppm, solving the problem of slightly mineralized underground well water failing drinking standards.

Commercial Centralized Water Purification Equipment

Core matching membrane for integrated pure water machines deployed in hotels, schools, office buildings and large shopping malls, cutting daily commercial water operation power costs.

Light Industrial Low-TDS Wastewater Recycling

Applied to on-site water reuse systems for cosmetic factories and food processing workshops with low organic and low-salinity production wastewater, supporting enterprises to achieve energy-saving emission reduction targets.

6. Standard Application Procedures

Raw Water Pretreatment Setup

Install multi-media filters, activated carbon filters and 5μm precision security filters in sequence to strictly control inlet SDI below 5.0 and remove suspended solids, colloids and trace residual chlorine that may damage the TMH membrane sheet.

Standard Membrane Installation

Load TMH-4040 or TMH-8040 elements into matched pressure vessels, assemble concentrated water O-rings and flow spacers correctly. Avoid scratching the polyamide separation layer during handling; ensure all pipeline connections are fully sealed without leakage.

System Low-Pressure Commissioning

Carry out fresh water low-pressure flushing after installation, then gradually boost to the standard operating pressure range. Maintain a single-element recovery rate within the recommended safe interval and conduct a 2–3 hour continuous trial run to record stable permeate TDS, flux and system pressure difference data.

Daily Real-Time Operational Monitoring

Track inlet water temperature, operating pressure, membrane inlet-outlet differential pressure and daily water output every working day. Adjust scale inhibitor dosing volume according to seasonal raw water salinity fluctuations to prevent surface scaling.

Timely Chemical Regenerative Cleaning

Initiate acid and alkali alternating cleaning once membrane flux declines by more than 20% or system differential pressure rises over 15% compared with initial test data. Control cleaning liquid temperature and pH within the designated safe range to restore original element performance.

Regular Shutdown Maintenance

For long-term system shutdowns, fill pressure vessels with 0.5%–1.0% sodium bisulfite protective liquid for sealed storage. For daily short-term shutdowns, complete low-pressure fresh water flushing to discharge concentrated salt water and prevent crystal precipitation on the membrane surface.

7. Working Principle

The TMH series operates based on optimized low-pressure reverse osmosis separation technology upgraded for low-salinity raw water environments. Under ultra-low external hydraulic pressure far below the threshold required by medium-pressure RO membranes, water molecules selectively penetrate the nano-scale pores of the cross-linked polyamide semi-permeable layer, while dissolved salt ions, tiny colloids and organic macromolecules are intercepted on the concentrated water side and discharged out of the system with concentrated brine.

The membrane surface adopts hydrophilic negative charge modification technology, generating electrostatic repulsion against charged impurity particles to reduce surface adsorption and slow fouling accumulation. The 34mil wide spiral flow channel strengthens raw water turbulent flow state, suppressing concentration polarization commonly seen in low-TDS water systems. The whole separation process relies purely on physical pressure filtration without adding extra chemical reagents during water production, achieving energy-saving and environmentally friendly high-efficiency water purification for long-term continuous operation.

8. Conclusion

The TMH series ultra-low energy brackish water reverse osmosis membrane has become a long-term best-selling product on Alibaba International Station, taking ultra-low pump power consumption, stable balanced desalination performance and universal interchangeable standard dimensions as its core market competitiveness. It successfully resolves the two major industry pain points of high operating costs for medium-pressure membranes and unstable water quality of cheap low-pressure elements.

Supported by our 100,000 ㎡ standardized production base, over 100 proprietary water treatment patents and strict full-link quality inspection mechanisms, TMH elements have passed long-term stability verification in thousands of global low-salinity water engineering projects, trusted by distributors and engineering contractors across all continents. With continuous iterative upgrades of membrane modification and spiral winding technology, the TMH series will capture broader market share in the global energy-saving water treatment industry, delivering reliable low-cost RO solutions for sustainable fresh water resource utilization.

9. Frequently Asked Questions (FAQs)

Q1: What core competitive advantages does the TMH series hold compared with other brackish RO membranes?

A1: Its biggest highlight is the 25%–35% reduction in pump energy consumption under ultra-low 100PSI standard pressure, paired with a guaranteed minimum salt rejection rate of 99.0%. It can directly replace imported ULP membranes without equipment renovation and carries a far lower factory bulk price than original imported low-energy RO elements.

Q2: What raw water TDS range is the TMH series suitable for?

A2: Designed exclusively for light brackish water, tap water and surface water with TDS ≤1000ppm. It is not applicable to seawater or high-salinity brine above 10,000ppm TDS; high-salinity projects should select our dedicated seawater membrane lines such as TSE and SWC5.

Q3: What is the standard service life of TMH elements under normalized operation?

A3: With complete supporting pretreatment, regular periodic chemical cleaning and strict compliance with rated operating pressure limits, the service life can reach 3–5 years. Long-term overpressure operation or unqualified inlet water with excessive SDI and residual chlorine will sharply shorten usable lifespan.

Q4: How frequently is chemical cleaning required for TMH series under standard inlet conditions?

A4: When inlet SDI15 remains stably ≤5.0 and raw water turbidity meets design standards, chemical cleaning only needs to be conducted once every 6–8 months, a longer cycle than ordinary medium-pressure brackish membranes.

Q5: Can TMH-4040 and TMH-8040 directly replace imported Toray ULP series membrane elements?

A5: Yes, both sizes adopt fully consistent universal industry outer dimensions, compatible with all original pressure vessels and pipeline systems without any system transformation work.

Q6: Does the factory support sample orders and bulk trade assurance cooperation?

A6: We accept single-piece sample orders for client water quality testing, with large-volume bulk discount policies for long-term distributors. All cross-border bulk orders are covered by Trade Assurance to fully safeguard buyer transaction security.

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