Manufactured under ISO 9001 certified quality systems, our spiral-wound RO elements serve as fully interchangeable aftermarket alternatives for mainstream industrial brackish water membranes, including drop-in replacement Hydranautics (Nitto) RO membrane solutions. The PROC series includes standard PROC10 and high-performance PROC20 grades, designed with elevated salt rejection and broadened chemical tolerance to handle variable-quality industrial streams featuring mixed organic pollutants, fluctuating pH values and multi-component dissolved solids.
Product Introduction
Manufactured under ISO 9001 certified quality systems, our spiral-wound RO elementsserve as fully interchangeable aftermarket alternatives for mainstream industrial brackish water membranes, including drop-in replacement Hydranautics (Nitto) RO membrane solutions. The PROC series includes standard PROC10 and high-performance PROC20 grades, designed with elevated salt rejection and broadened chemical tolerance to handle variable-quality industrial streams featuring mixed organic pollutants, fluctuating pH values and multi-component dissolved solids.
Generic standard brackish membranes show limited durability in challenging industrial wastewater conditions. They degrade rapidly after frequent chemical cleaning and struggle with organic fouling, resulting in continuous flux decline and shortened service cycles. The PROC20 adopts optimized cross-linked polyamide layers and turbulence-enhanced feed spacers to balance steady salt rejection and improved resistance to repeated acid and alkaline cleaning. With full dimensional compatibility with original Hydranautics PROC 8-inch elements, it supports plug-and-play replacement without vessel modification, pipe adjustment or pump recalibration during routine maintenance.
This membrane is specially positioned for industrial brackish water scenarios requiring frequent chemical cleaning. For high-pressure seawater desalination, our TM8 series provides dedicated seawater-grade elements. PROC20 fits low-to-medium pressure brackish industrial wastewater systems, delivering stable performance where seawater-rated equipment is not required and chemical cleaning frequency is high. For mineral-laden hard water recovery scenarios, our BR high-recovery anti-scaling series serves as the corresponding alternative solution.
Like all commercial polyamide RO elements, the PROC20 operates based on the established solution-diffusion mechanism. Under standard operating pressure, water molecules penetrate the dense polyamide active layer, while dissolved salts, heavy metal ions and organic contaminants are intercepted via molecular exclusion and surface charge repulsion to produce stable low-TDS permeate.
Its core technical optimization lies in a balanced material formulation: the cross-linked polyamide structure is tuned to reconcile high ionic rejection with chemical degradation resistance. This design achieves ≥99.4% nominal salt rejection while maintaining structural stability through multiple acid and alkaline cleaning cycles. It delivers reliable tolerance for mild feedwater pH fluctuation within the standard operating range, though its chemical resistance targets cleaning pH cycling rather than oxidative substances.
Equipped with corrugated turbulence feed spacers, the element eliminates flow dead zones, weakens concentration polarization under variable recovery conditions, and effectively slows combined organic and inorganic fouling in mixed-contaminant feed streams. After standardized chemical cleaning (pH 1–13, ≤35°C, single cycle ≤2 hours), flux recovers to 90–93% of nominal value, and salt rejection remains above 98% of rated standard, ensuring consistent long-term operational stability.
All parameters are tested per mainstream brackish membrane industry standards, with full dimensional consistency matching original Hydranautics (Nitto) PROC series elements for seamless on-site replacement.
Product Positioning: Interchangeable Hydranautics (Nitto) compatible brackish RO membrane, optimized for elevated salt rejection and enhanced chemical cleaning resistance for mixed-contaminant industrial feedwater
Structure: 8040 spiral-wound industrial RO element, fully compatible with standard PROC series pressure vessels
Standard Test Condition: 25°C, 155 psi, 2000 ppm NaCl, 15% recovery (industry-standard brackish test specification)
Stabilized Salt Rejection: ≥99.4% nominal, minimum guaranteed ≥99.2%
Nominal Permeate Flux: 8,500–9,000 GPD (±5% tolerance). For heavily contaminated feed streams, system design requires 20–30% flux derating to reduce polarization and fouling risk, extending operational service life
Operating Pressure Range: 160–280 psi (stable rejection baseline at 160 psi @ 25°C)
Continuous Temperature: 15–40°C; short-term peak tolerance 45°C (cumulative 2-hour maximum)
Operating pH Range: 2.0–10.0; cleaning pH tolerance: 1.0–13.0 (short-cycle only)
Maximum Feed SDI: ≤3
Single Element Pressure Drop: ≤12 psig
Active Area: 400 sq. ft.
Compatibility: 100% drop-in replacement for Hydranautics (Nitto) PROC series 8-inch RO systems
To standardize engineering application boundaries, PROC20 is designed for feed streams within clear operational thresholds: TDS ≤5,000 ppm, pH 2–10, COD ≤100 mg/L, SDI ≤3, and zero continuous free chlorine exposure. Any water quality beyond these limits requires customized pretreatment and operational adjustment.
Permeate flux decreases approximately 3% per 1°C temperature drop within the standard 15–40°C operating range, with complete temperature correction coefficients provided in official datasheets to support accurate seasonal engineering design calculations. A minimum stabilized salt rejection of 99.2% is fully guaranteed under rated temperature and feed TDS conditions, while prolonged operation above 40°C or excessive high-temperature exposure will accelerate polyamide hydrolysis and compromise long-term performance stability. All free chlorine must be completely neutralized through upstream pretreatment measures, as oxidative exposure causes irreversible structural damage consistent across all polyamide RO membranes; the PROC20’s enhanced chemical stability exclusively refers to improved endurance against repeated acid and alkaline cleaning cycles and mild feedwater pH fluctuations within the valid operating range, without oxidative chemical resistance. Continuous operation at a sustained pH above 10 is prohibited for regular service, with high-alkali conditions of pH 10–13 restricted solely to short-term standardized cleaning procedures. Under qualified mixed-contaminant industrial feed conditions including SDI ≤3, TDS ≤5,000 ppm and low-to-moderate COD levels, the PROC20 sustains stable system recovery ranging from 60–70%, delivering 5–10% higher reliable recovery capacity than standard brackish replacement membranes under identical complex water environments and creating distinct operational advantages for industrial wastewater reuse projects. For feedwater containing silica exceeding 50 mg/L, barium or strontium substances, customized anti-scalant formulations and properly reduced maximum recovery limits are necessary to prevent irreversible inorganic fouling and maintain long-term stable operation.
Featuring a scientifically optimized cross-linked polyamide formula, the PROC20 achieves a perfect balance of steady elevated salt rejection and targeted chemical resilience, effectively maintaining stable filtration performance and structural integrity during frequent acid and alkaline cleaning cycles. This unique structural optimization allows the membrane to adapt flexibly to industrial feedwater with fluctuating water quality and mixed organic and inorganic pollutants, reducing gradual performance attenuation caused by repeated chemical maintenance and extending the overall stable service cycle in complex water treatment scenarios. The membrane features full dimensional and structural consistency with original Hydranautics (Nitto) PROC series elements, enabling complete zero-modification retrofit compatibility; on-site element replacement can be finished during routine equipment shutdowns without vessel adjustment, pipeline transformation or pump recalibration, greatly lowering project retrofit investment and daily labor maintenance costs. Verified by abundant industrial field application data, the PROC20 extends routine chemical cleaning cycles by 22–33% compared with ordinary aftermarket brackish membranes under matched complex feed conditions, upgrading the conventional industrial cleaning cycle baseline of 60–70 days to 80–95 days and significantly reducing system downtime and chemical consumption for maintenance. 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 ordinary membranes after repeated cleaning. This consistent post-cleaning stability sustains long-term system water yield efficiency and effectively reduces annual membrane replacement frequency for large and medium-sized industrial water treatment plants.
Suitable Scenarios: Chemical plant wastewater recycling, landfill leachate pretreatment, mixed industrial effluent reuse, and variable-quality municipal brackish water purification projects that require frequent chemical cleaning and stable high rejection performance.
Unsuitable Scenarios: Seawater desalination with TDS >10,000 ppm, projects requiring strict boron removal, long-term over-limit pH operation, continuous free chlorine exposure, and feed water with unqualified SDI and untreated heavy pollution load.
All PROC20 membrane elements undergo strict mixed-contaminant water simulation testing before delivery, with complete batch traceability records. The production process complies with ISO 9001 quality management standards, and core performance indicators pass third-party professional testing. Finished membranes are vacuum-sealed with professional protective solution to prevent performance attenuation during transportation and storage, ensuring factory-standard performance after installation.
The R&D team continues to optimize cross-linked polyamide formulas and spacer structures, targeting lower operating pressure demand while retaining stable high salt rejection and chemical cleaning resistance. All upgraded versions will maintain full compatibility with traditional Hydranautics (Nitto) PROC series pressure vessels to ensure continuous retrofit applicability.
The PROC20 interchangeable Hydranautics (Nitto) RO membrane is a professional-grade brackish water element tailored for complex industrial mixed-contaminant feedwater. It balances elevated salt rejection and targeted chemical cleaning resistance, solving the pain points of poor cleaning tolerance and fast performance decay of ordinary brackish membranes in variable industrial water environments. With full plug-and-play compatibility, stable complex water adaptability and longer maintenance cycles, it provides a cost-effective and reliable replacement solution for industrial wastewater reuse and variable-quality brackish water treatment projects.
Q1: What are the core advantages compared with ordinary replacement membranes?
A1: It features balanced high rejection and chemical cleaning resilience optimized for industrial complex water, longer effective cleaning intervals, stable post-maintenance performance, and full dimensional compatibility with Hydranautics (Nitto) PROC systems, avoiding project transformation costs.
Q2: Is on-site equipment modification required for replacement?
A2: No modification is needed. It achieves full physical compatibility with original PROC series elements. Only fine pressure adjustment is required after installation. For polluted feedwater, 20–30% flux derating in system design is recommended to guarantee long-term stability.
Q3: What pretreatment is mandatory?
A3: Feedwater SDI ≤3, complete free chlorine neutralization, and control of COD, hardness and special ion indicators within the defined operating range. Reasonable pretreatment and chemical dosing are essential to sustain rated performance.
Q4: Can it be used for seawater desalination?
A4: No. This model is optimized for brackish industrial wastewater. Seawater desalination and high-precision boron removal scenarios require our dedicated seawater series membranes.
Q5: What cleaning methods apply to organic and inorganic fouling?
A5: Follow standard alternating acid and alkaline cleaning procedures. Biocide rinses can be added for biological fouling control. Oxidative chlorine-containing cleaners are prohibited to prevent irreversible membrane damage.
For site-specific recovery parameters, flux derating schemes, anti-scalant selection and water quality compatibility evaluation, please submit complete feedwater laboratory analysis reports to our engineering team for targeted technical guidance and project design suggestions.
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