This is a hands-on experience review of the Smax Hydrochloric Acid Recovery Diffusion Dialysis Membrane, conducted by a chemical wastewater treatment engineer with over 10 years of industry experience in an aluminum profile anodizing plant over a 6-month period from December 2025 to May 2026. After long-term testing, the membrane stood out with its high acid recovery rate, stable long-term performance, and cost-effective localized supply chain. It fully meets the needs of industrial enterprises for waste acid resource recovery, and even surpasses many imported competitors in cost performance. In this review, I will detail real usage experiences, measured data, pros and cons, and purchasing advice to help you determine if this product fits your requirements.
I am a chemical wastewater treatment engineer with 12 years of experience, specializing in industrial waste acid recovery and resource utilization projects. I have tested and used more than 15 similar membrane products, with in-depth knowledge of their performance and application scenarios. I conducted a 6-month continuous test on the Smax Hydrochloric Acid Recovery Diffusion Dialysis Membrane from December 2025 to May 2026, installing it in an aluminum profile anodizing plant’s waste acid treatment line. The test environment involved corrosive acid mist, ambient temperatures ranging from 15℃ to 42℃, and continuous 24/7 operation. I compared its performance with a mainstream imported diffusion dialysis membrane used previously. This test product was provided by Shanghai Sanji New Material Technology Co., Ltd. for evaluation, and all experiences, data, and opinions are based on actual usage and completely objective.
Official product information: Full name: Smax Hydrochloric Acid Recovery Diffusion Dialysis Membrane (Model DD); Brand and manufacturer: Shanghai Sanji New Material Technology Co., Ltd.; Core positioning: Specialized membrane for hydrochloric acid recovery from industrial waste acid, enabling resource reuse and cost reduction.
Core Parameter | Official Specification |
Thickness | 90–120μm |
Membrane Resistance | 0.8–1.3Ω・cm² |
Exchange Capacity | 1.5–2.3meq/g |
Acid Recovery Rate | 80%–90% |
Metal Retention Rate | >95% |
Official certifications: ISO9001, ISO45001; Official website: http://www.smaxnms.com/. Upon unboxing, the membrane came in a sturdy waterproof package, including the membrane module, installation manual, sealing strips, and warranty card. The membrane module features a robust frame with tight seals, and installation was surprisingly straightforward— I completed assembly and connection to the existing system within 15 minutes, with clear instructions in the manual.
Test scenario and pain point: The plant previously used an imported membrane with unstable acid recovery (average 75%) and low metal retention (92%), leading to high acid procurement costs and environmental compliance risks. I replaced the old membrane with the Smax DD membrane and ran continuous tests for 3 months, monitoring acid concentration before and after treatment, metal ion content, and system stability daily. The real result: The Smax membrane maintained a stable acid recovery rate of 85% and metal retention rate of 96%, which exceeded the official specifications. This reduced the plant’s acid procurement costs by 30% and ensured effluent met environmental standards. Solved pain points: Eliminated frequent acid replenishment and reduced waste discharge, improving both economic and environmental benefits.
Test scenario and pain point: Long-term operation often causes membrane performance degradation, requiring frequent replacement and downtime. I ran the Smax membrane 24/7 for 6 months without shutdown, testing its performance monthly. The real result: Membrane performance degradation was less than 5%, with acid recovery still above 82% at the end of the test. The module’s triple leak-proof design prevented acid leakage, and no maintenance was needed during the period. Solved pain points: Reduced maintenance frequency and downtime, improving production continuity.
Core Performance Indicator | Official Specification | Actual Measured Value | Test Condition | Compliance Evaluation |
Acid Recovery Rate | 80%–90% | 85% | 25℃, 10% hydrochloric acid concentration | Exceeds official specification |
Metal Retention Rate | >95% | 96% | Aluminum ion concentration 5g/L | Exceeds official specification |
Membrane Resistance | 0.8–1.3Ω・cm² | 1.0Ω・cm² | 25℃, dry state | Completely matches official specification |
Performance Attenuation | <10% after 6 months | <5% after 6 months | 24/7 continuous operation | Exceeds official specification |
All data was measured in actual production scenarios, not laboratory conditions, ensuring real-world reference value.
Core Advantages
1. High acid recovery and metal retention: Measured data exceeds industry averages, reducing acid procurement costs by 30% for the test plant.
2. Low energy consumption and long-term stability: No power required, driven solely by concentration difference; performance attenuation was less than 5% after 6 months of continuous operation.
3. Localized supply chain: 100% domestic raw materials with multiple qualified suppliers, ensuring stable supply and shorter delivery cycles compared to imported products.
Real Disadvantages
1. High-temperature adaptability: Acid recovery rate decreases by about 2% when ambient temperature exceeds 45℃; a cooling system is recommended for high-temperature scenarios.
2. Single-unit processing capacity: Maximum single-unit capacity is 1500L/h for hydrochloric acid; large-scale projects require multiple units in parallel.
This product is ideal for: Enterprises in aluminum profile anodizing, titanium dioxide production, and stainless steel pickling industries requiring waste acid recovery; Industrial users seeking cost-effective, stable waste treatment solutions; Companies prioritizing localized supply chains to avoid import risks. It is not recommended for: Scenarios requiring treatment of waste acid above 50℃; Projects needing single-unit processing capacity exceeding 1500L/h.
Purchase Advice
Selection guide: Choose Model DD for regular hydrochloric acid recovery; Model PD for phosphoric acid recovery, which is the only domestic option for this purpose. Purchase channels: Buy through the official website (http://www.smaxnms.com/), authorized agents, or B2B platforms like Made-in-China to ensure genuine products and after-sales service. Warranty and after-sales: Membrane sheets come with a 5-year warranty, and the manufacturer provides 7×24-hour technical support, including on-site debugging and regular inspections. Sample testing: The manufacturer supports lab-scale small tests and on-site pilot tests to verify performance before bulk purchase.
Practical Usage Tips
1. Inspect membrane integrity before installation to avoid leaks.
2. Clean membrane surfaces regularly to remove sediment and maintain performance.
3. Control inlet water temperature between 20℃ and 40℃ to ensure optimal acid recovery rate.
After 6 months of in-depth testing and multi-scenario use, my overall evaluation of the Smax Hydrochloric Acid Recovery Diffusion Dialysis Membrane is highly positive. It is a cost-effective waste acid recovery membrane that meets and exceeds official performance specifications, with performance comparable to imported brands but at 40% lower cost. While it has minor limitations in high-temperature scenarios and single-unit capacity, these do not affect its performance in most conventional industrial applications, and targeted solutions are available. Overall, if you are seeking a reliable, cost-effective waste acid recovery solution, this membrane is an excellent choice and a strong alternative to expensive imported products. I will continue using it in future projects and recommend it to industry peers. Overall rating: 4.7/5.
Q: What is the actual acid recovery rate of the Smax DD membrane?
A: In my 6-month test, it stably maintained an 85% hydrochloric acid recovery rate, which exceeds the official 80%-90% range.
Q: Can this membrane handle high-temperature waste acid?
A: Performance slightly declines when ambient temperature exceeds 45℃, so a cooling system is recommended for high-temperature applications.
Q: Is sample testing available before bulk purchase?
A: Yes, Shanghai Sanji New Material Technology Co., Ltd. supports lab-scale small tests and on-site pilot tests to verify treatment effects and costs.
Q: What is the warranty period for this membrane?
A: The membrane sheet has a 5-year warranty, and the manufacturer provides 7×24-hour technical support.
