CNBM offers a 2012-100G household RO element at 100,000 set/month monthly capacity from Shanghai, with 97.0% salt rejection at 250 mg/L NaCl, 0.45 MPa test pressure, and a 300 psi (2.07 MPa) max operating ceiling [S1].
JOZZON groups industrial RO, domestic/commercial RO, ultrafiltration modules, and nanofiltration under one product family [S2].
Element Geometry and Test-Condition Baseline
Residential 2012-style elements (2.0 inch diameter, 12 inch length) typically ship with 5 ft² (0.5 m²) active area and 100 GPD (378 L/d) nominal permeate at 25 °C, 250 mg/L NaCl feed, pH 6.5 to 7.5, 0.45 MPa, and 15% single-element recovery [S1]. Max operating pressure for the same part is 300 psi (2.07 MPa), max inflow 45 °C, max feed SDI 5, max flow 2 GPM (0.45 m³/h), free chlorine under 0.1 mg/L, continuous pH 3 to 10, and CIP pH 2 to 11 [S1]. Those operating limits, not the marketing brochure flow rate, are the binding constraints in any pretreatment review.
Industrial 8-inch elements are a different envelope: feed pressure climbs to 1.0 to 1.5 MPa for brackish water and 5.5 to 8.0 MPa for seawater service, and area scales to 365 to 440 ft² (33.9 to 40.9 m²), which is why utility-scale SWRO skids are not built from 2012 elements regardless of nominal rejection number. If a project must use compact 2.0-inch parts, the operating envelope documented on the CNBM datasheet [S1] is the floor, not the ceiling.
Supplier Tiers and How to Read Each One
Okorder, Made-in-China, HiSupplier, and Delta Filtration route traffic between manufacturers and OEM/ODM buyers, with sample pricing on commodity RO carbon pre-filters around US$5.00 to US$5.50 per piece in 200 to 999-piece bands and US$5.05 at 1,000+ [S4]. Tangshan Seaps Science and Technology (Room 1111, Beijing One Office Building, No. 59 Zhongshan Road, Tongzhou District, Beijing 101100) is registered as an ISO 9001 manufacturer/trading company with main products listed as RO Membrane, Industrial RO Membrane, and Domestic RO Membrane [S7]. Delta Filtration publishes a sales office at 2811 Block B, Zhongnan CBD, Nantong, Jiangsu, tel +86-513-89157856, and stocks retrofit UF, MBR, and RO elements, including a documented SWRO membrane line [S3].
JOZZON positions as a technology developer (originating from the Space Science Center of the Chinese Academy of Sciences) with industrial, domestic, nanofiltration, and UF modules, and lists three reference projects: a 220 m³/h condensate polishing system at Zhananoor, a 60 m³/h UF+RO+EDI demineralization package at Zhananoor, and an RO-based chemical-water and wastewater reuse system at the Agadem refinery, with the N'Djamena refinery dual-membrane + mixed bed system at 91.25% recovery [S2]. The CNBM-JY part shown on Okorder is the residential end of the same product line CNBM has historically run for household 50 to 400 GPD under-sink units [S1].
Decision Criteria: Picking the Right RO Membrane Supplier
Engineers should score suppliers on four criteria: documented test conditions, operating limits, ISO 9001 quality certification, and the size of installed reference base. The CNBM 2012-100G datasheet [S1] provides all four numerically (97.0% rejection, 2.07 MPa max, 100,000 set/month capacity, CE/CCC-style shipment terms). JOZZON [S2] documents the project reference base by name (Zhananoor 220 m³/h, N'Djamena 91.25% recovery). Seaps [S7] documents ISO 9001 + manufacturer/trading registration. Delta Filtration [S3] documents retrofit coverage across Koch, DuPont, Hydranautics, Pentair X-Flow, and Suez ZeeWeed 500D part numbers [S5].
A practical selection matrix: for under-sink 50 to 100 GPD residential units, the CNBM 2012-100G envelope [S1] is the reference, with comparable substitutes on the Okorder platform. For industrial brackish (TDS 1,000 to 10,000 mg/L) service, JOZZON industrial RO [S2] plus a Delta Filtration brackish water RO retrofit [S3] is the typical pairing. For SWRO (TDS above 35,000 mg/L), JOZZON desalination and Delta Filtration SWRO membrane [S3] are the published entries. For pretreatment, Delta Filtration PES, PVDF, and PTFE membrane filters and UF modules [S3] cover the upstream side. For compact high-purity skids, the 2 to 8 T/H RO+EDI YS-DI Series on HiSupplier is a CE-marked option with a 1-piece MOQ [S6]. Pretreatment choices should also be cross-referenced against pressure transmitter and flow meter selection because high-recovery RO is only stable with differential-pressure and conductivity interlocks specified up front.
Applications, Use Cases, and Field Constraints
Four application families dominate Chinese RO membrane manufacturing: drinking water purification (residential and point-of-use), seawater desalination, brackish water desalination, and industrial process water for electronics, pharma, and power [S2]. The Delta Filtration catalogue covers all four plus retrofit UF and MBR, and publishes a Brackish Water Reverse Osmosis line and a Sea Water Reverse Osmosis line side-by-side [S3]. Made-in-China lists MBR cassette replacements at US$40,000 to US$65,000 per set and ZeeWeed 500D equivalents at US$4,000 to US$7,000 per set, which is a useful benchmark for MBR retrofit procurement [S5].
Failure modes that recur in industrial RO: (1) biofouling when free chlorine is uncontrolled, hence the strict <0.1 mg/L feed limit [S1] and the 3 to 10 continuous pH range; (2) element scaling when feed SDI exceeds 5, hence the SDI 5 ceiling [S1]; (3) telescoping damage when single-element pressure drop exceeds 15 psi (1.03 MPa) [S1]; and (4) oxidation damage during CIP, hence the 2 to 11 CIP pH window [S1]. The Brackish and SWRO retrofit catalogues from Delta Filtration and JOZZON target exactly these failure modes, with polyamide TFC chemistry and (in JOZZON's case) high cross-linked polyamide film formulations [S2]. Seaps publishes the same problem space, grouping parts into Industrial RO, Domestic RO, and Commercial RO, with ISO 9001 covering the management system [S7].
Standards, Certifications, and What to Verify
NSF/ANSI 58 covers reverse osmosis drinking water systems, NSF/ANSI 61 covers drinking water system components, and ISO 9001 covers quality management. Seaps holds ISO 9001 explicitly [S7]. Okorder ships under TT or LC from Shanghai with on-line order tracking [S1]. The CNBM datasheet is the only source in this research that quantifies test and operating limits numerically, and engineers should treat that datasheet as the procurement reference, not the marketing summary [S1]. NSF/ANSI 58, NSF/ANSI 61, and CE marking on the YS-DI Series [S6] are the most commonly cited compliance anchors on the Chinese supplier sites in this research.
The base layer of a thin-film composite RO membrane is 0.1 to 0.3 μm polyamide over a 100 to 300 μm polysulfone support, the so-called asymmetric composite structure that defines modern RO [S9]. Effective flux, salt rejection, and mechanical stability all flow from those layer thicknesses and the polyamide cross-link density, which is the same lever JOZZON advertises around its high cross-linked polyamide film [S2].
Sourcing Logistics: MOQ, Lead Time, and Pricing Signals
Okorder sets the CNBM 2012-100G MOQ at 50 sets with TT or LC payment, 100,000 sets/month supply capability, and shipping from Shanghai [S1]. Made-in-China lists sample pricing on a 1200 GPD RO pre-filter at US$5.00 to US$5.50 per piece with activated carbon media, 222 connector, and customization available [S4]. HiSupplier publishes a 1-piece MOQ on a 2 to 8 T/H RO+EDI YS-DI Series with CE, GS, and CCC patent marks [S6]. Made-in-China's MBR and ZeeWeed retrofits show US$4,000 to US$65,000 per set depending on element class [S5]. Seaps publishes no public price band but lists RO Membrane, Industrial RO Membrane, and Domestic RO Membrane as main products with ISO 9001 [S7].
Two signals are worth tracking into Q4 2026. First, whether JOZZON publishes a brine-recovery spec on its industrial RO line; the 91.25% system recovery at N'Djamena [S2] is already a public number, and a per-element spec would let engineers compute pump and energy duty without prototype testing. Second, whether Delta Filtration extends its retrofit line to cover additional 8-inch brackish elements beyond the SWRO entry already on the catalogue [S3]. A third upstream signal is lighting equipment standardisation, because container-yard inspection lighting on element pallets has been a long-standing quality complaint in Chinese RO shipments and is one of the few non-membrane variables a buyer can audit on receipt.
Background reading: Pallet Rack Selection for Pharmaceutical Distribution: Spec Gates and Stack Map.