Industrial RO Membrane Elements

Industrial RO Membrane Elements:
6 Product Lines, One Manufacturer

Blue Membrane designs and engineers spiral-wound reverse osmosis elements in six product lines – low pressure, brackish water, seawater, fouling-resistant, residential/customized, and OEM cross-reference-compatible – built to drop into the pressure vessels your system already uses.

Blue Membrane spiral-wound RO membrane elements, industrial 4040/8040 housing sizes

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product lines, one manufacturer

99.5–99.8%

stable salt rejection across the range

4040 / 8040

standard industry housing sizes

OEM brands cross-referenced (DuPont, Hydranautics, Toray)

±0.5mm

tolerance on customized residential elements

±15%

permeate flow tolerance, all industrial lines

Picking the Wrong RO Element Costs More Than the Element

Spiral-wound reverse osmosis elements remove dissolved salts, organics, and contaminants from feedwater by pushing it through a semi-permeable polyamide membrane under pressure, the same filtration principle as every commercial RO membrane on the market – from the home water system to the industrial one. The element doesn’t cost you the price of the membrane sheet; it costs you the price of picking the wrong one for your pressure, recovery target, and feedwater chemistry.

Send a brackish-water element out into seawater pressure, and you’ll kill it fast because the membrane chemistry and feed spacer aren’t designed for that osmotic load – your only solution there’s the right element class, not a bigger pump. Stick a standard element into a highly fouling stream, and your cleaning cycle goes from months to weeks when the same effect would come from a 99.5% rejection number once the element deviates from the test conditions’ pH. Inadequate upstream sediment and particulate control speeds this up further — scale-related fouling remains an active area of membrane R&D industry-wide, including a 2025 silica-scale mitigation patent from Nitto Denko (Hydranautics’ parent company). And when a single OEM is the sole supplier, they get to set the price, dictate lead times, and make production delays your problem, not theirs.

While other single-OEMs operate on the principle of “once the part’s out the door, it’s your problem,” Blue Membrane engineers six element product lines around the opposite principle: low pressure/ULP for energy-sensitive commercial and industrial systems, brackish water for standard high-rejection duty, Seawater for desalination applications, Fouling-Resistant for high-TDS and reuse streams, Residential/Customized for OEM and light-industrial integrators, and a published OEM Cross-Reference Chart that matches our models directly against DuPont (FilmTec), Hydranautics, and Toray element classes. The remainder of this page outlines which product line suits which application, provides side-by-side comparisons with the elements you might be running now, and shows you how to qualify Blue Membrane as a second-source supplier without modifying the rest of your system.

150–225 psi test · 99.5–99.6% rejection

Blue Membrane MB-C1/C2 series Low Pressure / ULP RO membrane element

Low Pressure / ULP RO Elements

MB-C1 (energy-tuned, 150 psi, ultra low pressure) and MB-C2 (high-rejection, 225 psi) series for commercial and industrial pure-water systems where energy consumption and cost-per-gallon are equally critical factors — these low energy elements deliver energy saving, ultra low energy operation without giving up rejection.

See ULP specifications →

225 psi test · standard high-rejection duty

Blue Membrane MB-Z1 series Brackish Water RO membrane element

Brackish Water RO Membrane Elements

MB-Z1 series brackish water membranes for standard treatment across brackish and tap water feed profiles, featuring cross-reference capabilities for DuPont BW30-400/34, Hydranautics CPA3/CPA5-LD, and Toray TM720-400 element classes.

Explore the Brackish Water datasheet →

800 psi test · 99.7–99.8% rejection

Blue Membrane MB-H1/H2 series Seawater RO membrane element

Seawater RO Membrane Elements

H1 (maximum rejection) and H2 (energy-efficient, offering up to 20% higher permeate flow than H1) desalination membrane series designed specifically for seawater desalination applications, tested under 32,000 ppm NaCl.

See Seawater specifications →

Up to 10,000 ppm TDS · 35-mil feed spacer

Blue Membrane MB-Z2 series Fouling-Resistant RO membrane element

Fouling-Resistant Elements

MB-Z2 series engineered with an improved hydrophilic polyamide surface and a wider 35-mil feed spacer for use in high-fouling brackish water applications, municipal wastewater treatment reuse systems, and challenging industrial feed streams — built to resist organic matter and biological fouling across a wide total dissolved solids range.

View the Fouling-Resistant spec sheet →

50–1,600 GPD · ±0.5mm dimensional tolerance

Blue Membrane Residential and Customized RO membrane element

Residential & Customized RO Elements

Customizable options for diameter (35-90mm), length (180-333mm), end cap style, and seal type for residential, whole house, commercial RO membrane, and light-industrial housings – available from initial drawing through mass production.

See Residential/Customized specifications →

7 Blue Membrane models mapped · 3 OEM brands

Blue Membrane RO membrane element, OEM cross-reference compatible

Compatibility & Cross-Reference Chart

A published, source-cited cross-reference between Blue Membrane models and DuPont (FilmTec), Hydranautics, and Toray element classes — with an honest disclaimer on what “equivalent” does and doesn’t mean.

Open the full chart →

The 4-Signal Feedwater Match Grid

You’ll be far better off selecting by your application line first, before your model number. These are high-capacity, high-tech filtration systems, not one-size RO filtration — your pressure and recovery rate data will be at the per-element level, per the manufacturer’s “standard” test conditions on each data sheet, and the optimum choice always traces back to your actual feedwater and high quality water target.

Application	Recommended Line	Test Pressure	Recovery (per element)	Feedwater Note
Low-energy commercial/industrial pure water	Low Pressure/ULP (C1)	150 psi	—	Standard feed
Higher-flow commercial/industrial pure water	Low Pressure/ULP (C2)	225 psi	—	Standard feed
Standard brackish-water treatment	Brackish Water (Z1)	225 psi	—	Standard feed
High-fouling brackish / municipal reuse	Fouling-Resistant (Z2)	225 psi (max 600 psi)	15%	Up to 10,000 ppm TDS, SDI15 ≤ 6
Seawater desalination, max rejection	Seawater (H1)	800 psi (max 1,200 psi)	8%	32,000 ppm NaCl test basis
Seawater desalination, energy-efficient	Seawater (H2)	800 psi (max 1,200 psi)	8%	32,000 ppm NaCl test basis
Residential / OEM light-industrial, custom size	Residential/Customized	By design	By design	50–1,600 GPD custom flux range
Matching an existing FilmTec/Hydranautics/Toray element	Compatibility Chart	Per matched class	Per matched class	See chart for the closest class match

Blue Membrane also makes nanofiltration (NF) elements -tested at 100 psi for applications requiring high divalent-ion rejection – and zero-liquid-discharge (ZLD) high-pressure elements beyond these six lines for those niche needs; please contact your account team if yours is among them.

Not sure which line fits your feed water? See the FAQ below for a quick decision path, or get sizing help from an engineer →

Get Sizing Help from an Engineer

System Overview

Blue Membrane vs. Imported Brands — Cross-Reference, Not Guesswork

What the engineers we talk to will plainly state is the actual risk in switching element brands: not whether a part will fit, but mixing generations or rejection classes within a single pressure vessel.

The industry is explicit: “Never mix: Different manufacturers, Different rejection rates, Different membrane generations,” because doing so causes flow imbalance in which newer elements receive excess flow while the older ones bear a disproportionate burden, fouling earlier. It’s precisely for this reason that Blue Membrane offers these class-level equivalents, rather than expecting you to take an educated guess: your strategy should be to replace your entire vessel or entire skid on a matched-class basis, rather than distributing individual elements from a range of manufacturers. And remember: a rejection figure on its own isn’t always directly comparable to a second with a different test pressure or NaCl concentration – confirm the actual conditions before assuming equivalence. Whether you run commercial reverse osmosis, industrial reverse osmosis, or a full industrial reverse osmosis membrane train, the same principle applies regardless of brand names: match the rejection class, not just the housing size — a documented equivalent beats an unsupported claim from any traditional membranes supplier.

OEM Data Cross-Reference

Blue Membrane vs. DuPont, Hydranautics, Toray

Blue Membrane Model	Class / Application	DuPont (FilmTec)	Hydranautics	Toray
MB-C1-8040	ULP, low energy, high rejection (150 psi)	Eco Pro-400 (replaces BW30HRLE-440)	ESPA2-LD	TMG20-400
MB-C2-8040	ULP, higher flow, low energy (225 psi)	Eco Pro-400 / BW30HRLE-440	ESPA1-LD / ESPA2	TM720D-400
MB-H1-8040	Seawater, max rejection (800 psi)	SW30HRLE-400	SWC5-LD (or SWC4B-MAX)	TM820C-400 (or TM820E-400)
MB-Z1-8040	Brackish, standard high rejection (225 psi)	BW30-400/34	CPA3 (or CPA5-LD)	TM720-400 (or TM720D-400)
MB-Z2-8040	Fouling-resistant brackish (225 psi)	BW30FR-400/34	LFC3-LD	TML20-400 (or TML20-370)

Cross-references from industry-leading publicly-available replacement charts (Lenntech Membrane Comparison Chart, AXEON Membrane Comparison Chart MKT-542-B, RM Nanotech/Membranium Competitive Replacement Match Guide, Hydranautics, and DuPont product literature). This list includes approximate equivalents identified by element class, flow, test pressure, and application and shouldn’t be treated as a guaranteed direct substitution. Before any change-out, evaluate your feedwater characteristics and recovery target against each manufacturer’s data sheet, check housing and end-cap dimensions for proper fitment, and always attempt to match element class at the full-vessel level rather than the individual-element level across brands.

Technical Basis

Why Cross-Brand Matching Is Technically Possible

Interchangeability exists because standard housing and end-cap sizes for spiral-wound vessels (typically 4040, 8040) and standard ASTM D4516 test conditions (for RO and NF in spiral-wound and hollow fiber formats) provide a consistent baseline across the industry, even if internal chemistry varies among brands.

It is this consistency that makes the documented, class-based cross-references useful, and that leads Blue Membrane to list test pressure and rejection class alongside every product. And the same basic fact is what enables the widely accepted interchangeability between elements from DuPont (FilmTec), Hydranautics, Toray, LG Chem/LG Water Solutions, GE Water, and so forth by class. Across the industry, thin film composite chemistry is built around a common benchmark — rejecting particles down to roughly 0.0001 micron, the accepted 0.0001 threshold for RO-grade separation — even though each brand’s proprietary chemistry differs, as shown by a 2025 composite-membrane patent from KAUST researchers exploring next-generation polyamide additive chemistry.

Cost Analysis

Total Cost of Ownership — What Actually Drives It

Lowest element price-per-unit often proves the most costly when you factor in transition time, failure risk, and application support.

Introducing mixed element classes or generations within a single vessel will shorten the lifespan of older elements, as they become disproportionately burdened and begin fouling sooner than you may have anticipated.

industrial RO typically produces 70-90% recovery and 90-99% rejection – the exact amount of either varies depending on your feedwater characteristics and configuration; thus the most significant factor in your total cost of ownership is whether the system that’s installed for your feedwater source is the correct one for your needs.

Sources: industry supplier-selection guidance and published RO operating parameter ranges (see References). No single membrane-specific ROI/payback study met our sourcing bar for this page — we’d rather show you the real cost factors than a number we can’t stand behind. The trade-off is always the same one: match the right line to your feedwater, don’t chase the lowest price per element.

Need a specific model matched to your existing housing? Get a detailed cross-reference quote

RO TECHNOLOGY

Where Blue Membrane Elements Run

Our six lines correspond to the specific market applications that we list in our literature: desal, pure water production, industrial water process, reuse water, food and beverage water processing and commercial water purification systems — all built around one goal, consistent high quality water you can verify. Real data points taken from two independently published articles quantify the value of what the terms “reuse” and “fouling resistant” mean in actual terms.

Ultrapure Water From Saline Industrial Effluent

Peer-reviewed case study, published 2025-04-07

canned-food-industry effluent (sodium chloride, calcium carbonate, calcium salts)

An integrated RO + ion-exchange system to treat the highly saline effluent from canned-food production was demonstrated in a peer-reviewed 2025 study at 65-70% water-recovery rate for a production cost of $2.62/m³ using sodium hexametaphosphate as antiscalant – this combination of high-TDS tolerance and recovery rate is exactly the space in which our Fouling-Resistant line was designed. The science of anti-fouling membrane chemistry is indeed industry wide, not just some talking points for the Blue Membrane. There was an entirely different paper on the 2025 International Water Conference program, this time detailing the zwitterionic RO membrane chemistry in the stable, high-recovery treatment of refinery high-salinity wastewater.

Seawater Line Performance Gap: H1 vs. H2

Blue Membrane internal specification data

Our own H1 and H2 seawater series, tested under identical conditions (800 psi, 32,000 ppm NaCl, 25°C), show the real engineering trade-off between rejection and energy: H1-8040 delivers 7,500 GPD at 99.8%/99.7% stable/minimum rejection; H2-8040 delivers 9,000 GPD — 20% more permeate — at 99.7%/99.6%. It’s a design decision, not a marketing one: take H1 when the rejection margin is the critical factor, take H2 when energy cost matters more — it depends on your water.

Unlike a vendor case study that only promises results, this ultrapure-water data comes from a peer-reviewed, independently published source, not our own copywriters. Trust in this market is earned the same way engineers say it’s lost: “FilmTec remains the standard all others try to match. So much so that there are counterfeit FilmTec membranes out there.” A cross-reference chart with disclosed sources and real test conditions is how a newer manufacturer earns that same trust — not by simply claiming it.

“All of the models in our cross-reference guide contain the actual test pressure and NaCl concentration at which they were tested – not just a rejection percentage. If a buyer is going to attempt to match up one of our element against a FilmTec or Hydranautics number, they should match apples to apples when testing them.”

— Senior Application Engineer, Blue Membrane

Have a specific feedwater profile you need to match? Get a specific quote based on your application →

Manufacturing Quality Behind Every Element

QUALITY CONTROL STANDARD

This is what closes that gap, right down to the last percent: If a rejection claim of 99.5% can't be linked to its test pressure, it’s marketing-not science. We’ve observed that the procurement teams who analyze RO element manufacturers don’t give ‘trusted partner’ language the time of day-one municipality RFP we’ve encountered actually evaluates a bid’s installation history, after-sale support, and lead times as distinct items, rather than just one ‘reputation’ line item. That’s the standard against which we're striving to build: membranes whose quality you can verify, not just attest to.

Instead of relying on an unsubstantiated certification, every Blue Membrane element is manufactured to a documented test condition, since a rejection number without pressure, chlorine tolerance, and NaCl concentration does not pass muster-it is delivered as part of your datasheet, model number included, not obscured within a quote request.

Our industrial-grade lines (low pressure/ULP, brackish water, Seawater, Fouling-Resistant) conform to ASTM D4194-the industry-wide RO/NF performance standardization method for spiral-wound elements — tested against a documented free-chlorine tolerance of under 0.1 ppm across the range, in line with EPA WaterSense's certification specification for RO systems. You can expect that same level of performance and quality as you would from any reputable industrial RO supplier, without any of the additional markup associated with a single source.

ASTM D4516

RO/NF performance standardization — industrial lines

Documented Test Conditions

Pressure / NaCl / temp / pH on every datasheet

±0.5mm Tolerance

Customized residential/OEM elements

Cited Cross-Reference

Sources disclosed, not just claimed

Third-party certifications are stated only when supported by a current, model-specific certificate and a verifiable public listing.

Need our full test-condition data sheets for a bid package?

State-of-the-Art Industrial RO Membrane Elements Workshop

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RO Procurement

How to Order: Pricing Factors, Lead Time, and Support

Blue Membrane develops each quote around your specific application rather than relying on a standard price list, as a quotation that ignores the characteristics of your feedwater and housing dimensions is purely a guess.

Pricing Factors Framework

Line of element and rejection class (low pressure through Seawater cover a test pressure range of 150-800 psi and vary in membrane chemistry costs).
Order volume and standard versus custom dimensions. Housing size (4040 vs. 8040).
Whether application-engineering support is needed (e.g., feedwater-specific CIP and anti-fouling guidance).
Shipping destination and Incoterms.

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“The lowest price rarely translates into the best value. I've seen many procurement professionals learn this through costly experience.”

This statement represents a very real risk, not a sales pitch. A discrepancy between an element’s quoted unit price and its overall lifetime cost only comes into play once a vessel filled with mixed brands begins to prematurely foul, as the rejection classes weren't appropriately matched during the design phase.

“The least expensive option isn't always the most optimal... Be aware of the additional expenses incurred when changing suppliers, such as potential downtime and the cost of transition.”

On switching/adding a second source: advice is uniform that partially replacing elements in a mixed-brand vessel will result in an imbalance and accelerated fouling of existing elements. We recommend - like the rest of the industry - that you select a Blue Membrane unit in its entirety or by skid based on a full cross-reference class, not by piecemeal replacement.

An example in practice, on what you, the buyer should look out for: one municipal water treatment RFP we looked at explicitly called out "after sale support/local representation" and "lead time for elements and delivery" separately (15 points total), along with an expectation for at least 10 years of install history. If you build your own supplier evaluation form, these are things to ask, not assume. Same goes for asking your housing supplier - we get questions after you've gone and done this already; an honest cross-reference is only good if the rest of the supply chain is honest.

Instead of quoting a number that may need to be adjusted later based on your unique requirements, please contact Blue Membrane for a custom quotation based on your application parameters. Ready to qualify Blue Membrane as a second source? Request a quote →

Industrial RO Performance & Engineering Tools

OEM Cross-Reference Finder

Select the brand and element class you currently run — see the closest documented Blue Membrane equivalent, by test pressure and application, not just a rejection percentage.

Which Line Fits Your Application?

Answer three questions about your feedwater and priority — get a recommended product line, based on the same test-condition data on our datasheets.

System Recovery & Flow Calculator

Estimate permeate and concentrate flow from your feed rate and target system recovery. Industry-wide, industrial RO systems typically run 70–90% system recovery depending on feedwater and configuration.

FAQ

How do I choose the right industrial RO membrane element for my system?

Don't base selection on current supplier, start with feedwater: The line of separation will vary by whether the feed is brackish water, seawater, or highly fouling water. Your specific application will narrow down the model within that line, but it all starts with the reverse osmosis water quality you need. We design every line to specific pressure and rejection window, anywhere from 150 psi through extremely low pressure ULP options up to 1,200 psi. If your elements can't be sourced in the line you want to run, don't assume the one size fits all model you currently have will still perform the way you expect — check the high rejection rate of NaCl it was actually tested at. Refer to the grid, and confirm that the conditions for that line, matches your feedwater data.

Will a Blue Membrane element fit my existing DuPont or Hydranautics housing?

All of our elements are supplied in a 4040 or 8040 housing, to a specification and class match per our online cross-reference chart. Match by full vessel, not by element class and verify housing and end-cap compatibility before you order.

What is the typical lifespan of an industrial RO membrane element before replacement?

Elements don't have a definite life span and their performance will be based on rate of fouling and cleaning routine, not on time. Advice is divided on this but there's some evidence that the commonly-used "three-year replacement policy" is too aggressive and suggests tracking permeate conductivity in individual vessels rather than replacing on a fixed schedule. Whether you call them replacement membranes, replacement membrane elements, or reverse osmosis membrane replacements, the rule is the same: track performance, don't replace on a calendar.

What are the main factors that affect industrial RO membrane element pricing?

The variables for each: membrane line, rejection class, custom vs. standard size, quantity, housing size, application-engineering services and terms. See the "Pricing Factors" diagram at the top of this page for a detailed breakdown.

Is it safe to replace just one failing element instead of the whole vessel?

Engineering guidance advises against mixing elements from different manufacturers, membrane types, or classes within the same vessel; newer elements can take a disproportionate share of the flow, overloading older elements and accelerating fouling. Replace at the full-vessel level using an approved cross-reference class.

Why should we consider a new manufacturer instead of staying with our current OEM?

Being single-sourced does have a downside: Relying on a single manufacturer’s pricing, lead time, and continuity forces you to make an on-the-fly qualification if you ever actually require a second source. A class-matched, cross-referenced second source isn't necessarily a symptom of an unhappy relationship with your current supplier; it's just common sense in industrial procurement to add this measure of risk reduction.

Does the Residential/Customized line carry NSF/ANSI 58 certification?

NSF/ANSI 58 is the US standard specifically for point-of-use residential RO systems, and EPA WaterSense requires it as the baseline certification for its residential RO label. Confirm current certification status for the specific model and market you need before specifying — we'll provide certificate references on request rather than assert a status here we haven't verified with you directly.

Which types of industrial RO membrane elements does Blue Membrane manufacture?

The full product lineup for Blue Membrane consists of six lines of RO membrane elements plus the OEM Cross-Reference Chart: low pressure/ULP, brackish water, Seawater, Fouling-Resistant, Residential/Customized, and the OEM Cross-Reference Chart that covers all industrial lines against DuPont, Hydranautics and Toray classes. Additionally, Blue Membrane offers custom manufactured nanofiltration (NF) and zero-liquid-discharge (ZLD) elements beyond these six lines.

Industrial RO Membrane Elements