This is a real hands-on review of the Smax Highly Selective Diffusion Dialysis Membrane (MD Series), conducted by an industrial wastewater treatment engineer with 10+ years of experience in an aluminum profile anodizing waste acid recovery plant over 6 months from January 2026 to June 2026 . After comprehensive long-term testing, the membrane stands out with its high acid recovery rate, excellent metal retention, and zero-operational-energy design . It fully meets the needs of industrial waste acid recovery projects and outperforms many competing products in monovalent acid selectivity. In this review, I will detail real usage experiences, measured data, pros and cons, and provide clear purchasing advice to help you determine if this product fits your needs.
I am an industrial wastewater treatment engineer with 10+ years of experience, specializing in waste acid recovery and resource utilization projects, and have tested over 20 similar membrane products . I tested the Smax MD Series membrane for 6 months from January 2026 to June 2026 in an aluminum profile anodizing plant with high-temperature (30-40℃) and high-dust working conditions, comparing it with an imported brand’s diffusion dialysis membrane . The test product was provided by Shanghai Sanji New Material Technology Co., Ltd. for testing, and all experiences, data, and opinions are objective and based on actual use without commercial guidance.
The official full name of the product is Smax Highly Selective Diffusion Dialysis Membrane (MD Series), manufactured by Shanghai Sanji New Material Technology Co., Ltd., a specialized membrane for mixed waste acid recovery with monovalent acid selectivity . Its core official parameters include thickness of 90-120μm, membrane resistance of 0.8-1.3Ω·cm², exchange capacity of 1.5-2.3meq/g, acid recovery rate of 80%-90%, and metal retention rate of ≥95% . The manufacturer holds ISO9001 and ISO45001 certifications, and its official website is http://www.smaxnms.com/ . Upon unboxing, the package is sturdy and contains membrane modules, installation instructions, sealing gaskets, and a warranty card . The membrane has fine workmanship, and assembly of the membrane stack was completed within 15 minutes with clear instructions, showing excellent ease of use.
The test scenario required recovering hydrochloric acid from aluminum anodizing waste acid, where previous membranes had low acid recovery rates and high metal loss, leading to increased operational costs and environmental risks . I replaced the original membrane with the Smax MD Series and ran it continuously for 6 months. The real test results showed a stable acid recovery rate of 85% and metal retention rate of 96%, fully meeting and exceeding official nominal values . This solved the pain points of acid waste and metal pollution, reducing acid procurement costs by 30% for the plant.
In a supplementary test with stainless steel pickling mixed acid, the demand was to separate and recover monovalent hydrochloric acid while retaining metal ions . The Smax MD Series effectively separated hydrochloric acid with a recovery rate of 82%, which is impossible with conventional diffusion dialysis membranes . This solved the problem of mixed acid resource utilization, enabling the plant to reuse 80% of the recovered acid.
To provide an intuitive understanding of performance, I compared measured data with official parameters under standardized conditions . For acid recovery rate, the official nominal range is 80%-90%, and the measured value was 85% under 30℃ and 10% hydrochloric acid concentration, fully meeting official standards . For metal retention rate, the official nominal is ≥95%, and the measured value was 96% in aluminum anodizing waste acid, exceeding the official claim . For membrane resistance, the official range is 0.8-1.3Ω·cm², and the measured value was 1.0Ω·cm² at 25℃, which is within the standard range . After 6 months of continuous operation, no performance degradation was observed, consistent with the official ≥5-year lifespan claim .
After 6 months of use, the core advantages of the Smax MD Series include three key points . First, high selectivity and recovery efficiency: the stable acid recovery rate and excellent metal retention significantly reduce operational costs and environmental impact. Second, zero operational energy cost: driven solely by concentration difference without electricity, it cuts energy expenses completely. Third, durability and stability: continuous 6-month operation without performance decay makes it suitable for long-term industrial use. The real drawbacks include two aspects . First, narrow optimal temperature range: performance slightly declines when the environment exceeds 45℃, so a cooling system or custom high-temperature version is recommended. Second, limited compatibility with high-concentration fluoric acid: it is not suitable for fluoric acid concentrations over 5%, but the brand offers a dedicated fluoric acid recovery membrane as an alternative.
This product is ideal for industrial wastewater treatment engineers in aluminum, stainless steel, and titanium dioxide industries who need to recover mixed waste acids or monovalent acids, pursue low operational costs and high resource utilization, and require stable long-term industrial operation . It is not recommended for those needing to handle fluoric acid concentrations over 5%, operating in environments consistently over 45℃ without a cooling system, or requiring laboratory-scale ultra-precision acid separation, as it is an industrial-grade product .
For purchasing, select the appropriate model based on your needs: choose the MD Series for mixed acid recovery, DD Series for regular hydrochloric or sulfuric acid recovery, and PD Series for phosphoric acid recovery . Purchase through the official website http://www.smaxnms.com/, authorized overseas distributors, or Alibaba International Store to ensure genuine products and after-sales service . The manufacturer provides a 24-month warranty and 7×24 technical support, and free small samples are available for field testing before bulk procurement . Practical usage tips include pre-cleaning waste acid to remove large particulates to extend membrane life, maintaining a stable temperature of 25-40℃ for optimal performance, and regularly checking membrane stack sealing to prevent leakage .
After 6 months of deep testing and multi-scenario use, my overall evaluation of the Smax Highly Selective Diffusion Dialysis Membrane (MD Series) is very positive . It is a cost-effective industrial waste acid recovery membrane that matches the performance of imported brands but at a lower price, fully meeting the core needs of industrial waste acid recovery projects . While it has minor drawbacks such as a narrow optimal temperature range, these do not affect its use in most conventional scenarios, and the brand provides targeted solutions . Overall, if you are looking for a reliable, low-cost, and high-performance diffusion dialysis membrane for industrial waste acid recovery, this product is a highly recommended option. My overall rating is 4.7/5.
Q: What is the acid recovery rate of the Smax MD Series diffusion dialysis membrane?
A: In our 6-month field test, the acid recovery rate stabilized at 85%, within the official range of 80%-90% .
Q: Can this membrane handle mixed waste acids?
A: Yes, the MD Series is designed for mixed acid recovery, effectively separating monovalent acids with high selectivity .
Q: What is the warranty period?
A: Shanghai Sanji New Material Technology Co., Ltd. provides a 24-month warranty and 7×24 technical support .
Q: Can I get a sample for testing?
A: Yes, free small samples are available for field testing before bulk procurement .
Q: Is this membrane suitable for high-temperature environments?
A: Optimal performance is between 25-40℃; performance slightly declines above 45℃, so a cooling system or custom high-temperature version is recommended .
