Ultra-Low Pressure (ULP) RO Elements | 150 PSI & 11,000 GPD

// MODULE-02 / PROCUREMENT STRATEGY

Dual-Track Procurement.
Zero Compromise.

As a global turnkey integrator, we understand that every project has different CapEx limits. We offer two distinct procurement tracks to secure your supply chain.

Zero-Tolerance Projects

100% Genuine Tier-1 Brands

For government-funded municipal drinking water plants where brand specification is mandatory. We leverage our massive integrator purchasing power to supply factory-fresh elements directly from global warehouses.

DuPont™ Toray® Hydranautics® SUEZ® LG Chem

CapEx Optimization

WANDONG OEM Equivalents

For commercial pure water plants and light brackish water treatment. Achieve 100% of Tier-1 performance at 60% of the cost. Utilizing highly permeable polyamide chemistry specifically formulated for 150 PSI low-pressure operation.

WANDONG MEMBRANE

// MODULE-03 / SPECIFICATION MATRIX

Universal 8040 Compatibility.

Standardized testing conditions per ASTM D4516. Data represents typical values for WANDONG OEM equivalents.

WANDONG Nomenclature

WD

+

ULP

+

400

Drop-In Replacement Targets

DATA SOURCE: OEM TECHNICAL BULLETINS

Application Class	DuPont FilmTec™ Target	Hydranautics® / Toray® Target	WANDONG OEM Equivalent
Standard Ultra-Low Pressure 150 PSI / High Flow (400 ft²)	LE-400	ESPA2-LD / TMG20D-400	WD-ULP-400 MATCH
High-Rejection ULP 150 PSI / 99.5% Rejection	ECO PRO-400	ESPA2 MAX	WD-ULP-400HR MATCH
Extra-Low Energy / High Yield Max Active Area (440 ft²)	XLE-440	ESPA4 MAX / TMG20D-440	WD-XLE-440 MATCH OPEX KILLER Maximum Efficiency: Combines 440 ft² active area with highly permeable chemistry to deliver massive flow rates at the absolute lowest feed pressure.

WANDONG OEM Verified Parameters

Model	Active Area ft² (m²)	Permeate Flow GPD (m³/d)	Nominal Rejection	Spacer Thickness (mil)	Test Pressure PSI (MPa)
WD-ULP-400	400 (37.2)	11,000 (41.6)	99.0%	28	150 (1.03)
WD-ULP-400HR	400 (37.2)	10,500 (39.7)	99.5%	28	150 (1.03)
WD-XLE-440	440 (40.9)	12,000 (45.4)	99.0%	28	150 (1.03)

* ULP Test Conditions: 1500 mg/L NaCl, 15% Recovery, 77°F (25°C), pH 7.0, 150 PSI.
* Performance Disclaimer: Data represents typical values and does not constitute a guaranteed minimum. Flow rates for individual elements may vary but will be no more than 15% below the value shown.

Process Engineer's Note: The OPEX Advantage

By dropping the operating pressure from the standard 225 PSI (BWRO) to 150 PSI (ULP), a 10,000 m³/day municipal water plant can reduce its high-pressure pump energy consumption by approximately 30%. For low-salinity surface water, ULP elements offer the fastest ROI in the industry.

// MODULE-04 / MECHANICAL COMPATIBILITY

100% Drop-In Ready.

No retrofitting required. WANDONG OEM 8040 elements adhere strictly to the global dimensional standard. They slide perfectly into any standard 8.0" FRP pressure vessel (e.g., Codeline, Protec, ROPV) utilizing your existing Anti-Telescoping Devices (ATDs) and interconnectors.

Physical Specifications

Element Wet Weight

16.0 kg (35.2 lbs)

Permeate Tube Extension

1.125 inch (28.6 mm) ID

Outer Wrap

Fiberglass Reinforced

Membrane Type

Polyamide Thin-Film Composite

40.0" Standard Length

7.9" Outer Diameter

1.125" Permeate Tube ID

8040 ELEMENT

A: 40.0" (1016 mm)

B: 7.9" (201 mm)

// MODULE-05 / ENGINEERING ANATOMY

Deconstructing the Low-Energy Core.

How do we achieve massive flow rates at just 150 PSI? Explore the highly permeable polyamide chemistry designed specifically for low-salinity water purification.

3-Layer Polyamide Thin-Film Composite RO Membrane Structure for ULP Elements

3-Layer Composite

1. Highly Permeable Polyamide Layer

Unlike SWRO membranes that require dense cross-linking to block high salt concentrations, the ULP active layer is chemically engineered to be highly permeable. It allows water molecules to pass through with minimal hydraulic resistance, achieving 11,000 GPD at just 150 PSI.

2. Polysulfone Microporous Support

Provides a smooth, defect-free substrate for the ultra-thin polyamide layer. It ensures structural integrity during continuous operation and chemical cleaning cycles (pH 2-12).

3. 28-mil Standard Feed Spacer

Optimized for relatively clean feed water (SDI < 5). The 28-mil spacer strikes the perfect balance between maximizing the active membrane area (up to 440 ft²) and maintaining adequate cross-flow turbulence to prevent scaling.

4. Interlocking ATD (End-Cap)

Features advanced end-cap construction with exhaust vents to mitigate hydraulic shock during system startup, drastically reducing the risk of element telescoping or mechanical damage.

// MODULE-06 / OPERATING LIMITS

Comprehensive Operating Limits.

Strict adherence to these parameters ensures optimal performance and validates the 12-month limited warranty.

Membrane Type	Polyamide Thin-Film Composite
Maximum Operating Temperature	113°F (45°C)
Maximum Operating Pressure	600 psi (4.14 MPa)
Max Pressure Drop (Single Element)	15 psi (0.10 MPa)
pH Range, Continuous Operation	3 - 10
pH Range, Short-Term Cleaning (30 min)	2 - 12
Maximum Feed Flow Rate	75 gpm (17 m³/h)
Maximum Feed Silt Density Index (SDI)	SDI 5
Free Chlorine Tolerance	< 0.1 ppm

General Handling & Preservation

Keep elements moist at all times after initial wetting.
To prevent biological growth during prolonged system shutdowns, immerse elements in a preservative solution (e.g., 1% SMBS).
Avoid static permeate-side backpressure at all times.

System Startup Protocol

To prevent hydraulic shock and membrane damage during initial startup, shutdown, or cleaning, strict adherence to the following sequence is mandatory:

0. Pre-treatment Verification: Ensure all upstream UF or multi-media filters are fully commissioned before loading RO elements.
1. Feed pressure should be increased gradually over a 30-60 second timeframe.
2. Permeate obtained from the first hour of operation must be discarded.

// MODULE-08 / SELECTION GUIDE

TDS-Based Element Selection.

Selecting the correct membrane series based on feed water Total Dissolved Solids (TDS) is critical for minimizing OPEX and preventing premature fouling.

TDS < 2,000 ppm

Tap Water / Light Brackish

ULP Series (Ultra-Low Pressure)

Operates at an extremely low 150 PSI, drastically reducing electrical OPEX while maintaining 99.0% rejection. Ideal for municipal purification.

Currently Viewing

TDS < 10,000 ppm

Brackish Water / Wastewater

BW & FR Series (Standard/Fouling-Resistant)

The industrial standard operating at 225 PSI. Use the FR series (34-mil spacer) for high-COD wastewater reuse to prevent biological fouling.

View BW Elements

TDS > 10,000 ppm

Seawater / High Salinity

SWRO Series (Seawater RO)

Engineered for extreme conditions. Withstands up to 1200 PSI to overcome massive osmotic pressure, delivering 99.8% rejection.

View SWRO Elements

// MODULE-09 / APPLICATION SCENARIOS

Maximum Flow. Minimum Energy.

When treating low-salinity surface water or municipal tap water, electrical OPEX is your biggest enemy. ULP elements are deployed globally to maximize water plant profitability.

Municipal Drinking Water

Slashing high-pressure pump electricity costs for large-scale public water infrastructure.

Beverage and Bottled Water Production Plant RO System

Food & Beverage

Providing high-volume, purified ingredient water for breweries and bottling plants.

Commercial Pure Water

Ideal for hotels, hospitals, and commercial RO skids operating on municipal tap water.

Surface Water and River Water Desalination Plant

Surface Water Treatment

Efficiently desalinating low-TDS river and lake water for industrial utility use.

// MODULE-10 / FACTORY & INVENTORY

Massive Inventory.
Global Dispatch.

We are not a trading company. WANDONG ENVIRO operates a heavy-duty manufacturing base and maintains a massive inventory of both Tier-1 (DuPont/Toray) and OEM elements. When your plant faces a critical shutdown, we execute emergency air-freight dispatches within 48 hours.

ISO 9001 & ISO 14001 Certified Facility

10,000+ Elements in Standing Stock

VIP Wholesale Rates with DHL/FedEx

Automated RO Membrane Rolling Production Line

Massive Warehouse Stock of 8040 RO Membranes

RO Membrane Quality Control and Vacuum Testing

// MODULE-11 / PROVEN IN THE FIELD

Powered by WANDONG.

We don't just sell components; we build the heavy-duty systems that rely on them. Our ULP elements are the beating heart of our own containerized Municipal Drinking Water plants deployed across the globe.

The Integrator's Advantage

Because we use these exact membranes in our own $500,000+ EPC projects, they undergo rigorous internal quality control that pure trading companies simply cannot match. We stake our entire plant's performance on these elements.

FIELD DEPLOYMENT

WANDONG Municipal RO Skid

Showcasing the 8040 FRP pressure vessels loaded with our ULP membranes.

// MODULE-12 / THE ENGINEER'S UNBOXING

Built for the Field.
Delivered with Certainty.

We don't just ship a plastic tube. We deliver a risk-free deployment experience engineered for remote sites and harsh environments.

Industrial-Grade Traceability

High-contrast waterproof labels with exact specs, batch numbers, and a unique serial number (S/N). Matched to our OEM database to eliminate gray-market risks. No guessing for your field team.

QC Certificate & Guide Inside

Open the box and find the hardcopy QC Pass Certificate and CIP cleaning guide right on top. Out-of-the-box trust that saves your engineers from digging through email threads.

Export-Grade Preservation

Vacuum-sealed in heavy-duty moisture-barrier foil with a 1% Sodium Metabisulfite (SMBS) preservative solution, encased within rigid telescopic cartons. Engineered to resist harsh global transit, ensuring a secure 12-month shelf life under proper storage.

// MODULE-13 / LOGISTICS MATRIX

Optimized for Global Transit.

We speak the language of freight forwarders. CBM optimized for both rapid air-freight and mass FCL sea-freight.

Single 8040 Carton

Dimensions (L×W×H)

~1050 × 220 × 220 mm

Gross Weight

~16.5 kg (36.3 lbs)

Net Weight

~14.5 kg (31.9 lbs)

Volumetric Weight

~10.16 kg (Air-Freight)

* Values are industry-standard approximations including heavy-duty export packaging.

Standard Pallet

25 pcs

EUR Pallet (1.2x1.0m), Shrink-wrapped

20ft Container

400 pcs

FCL Loading Capacity (16 Pallets)

// MODULE-14 / GLOBAL O&M SUPPORT

Direct Access to Senior Process Engineers.

Don't let improper CIP protocols destroy your new elements. Our clients get direct WhatsApp and Email access to our senior engineers for fouling diagnostics, acid/alkaline cleaning formulas, and step-by-step replacement guidance.

CIP Formulas Fouling Diagnostics 24/7 Standby

Chat with Engineer Email Support Desk

// MODULE-15 / TECHNICAL FAQ & WARRANTY

Hardcore FAQ.
Engineering-Grade Answers.

What is the difference between ULP and standard BW elements?

The primary difference is the Operating Pressure (OPEX).

Standard BW elements require 225 PSI to operate efficiently. ULP (Ultra-Low Pressure) elements use a highly permeable polyamide layer that achieves the same flow rate at just 150 PSI. If your feed water TDS is below 1500 ppm, switching to ULP elements will slash your high-pressure pump electricity costs by up to 30%.

Is WD-ULP-400 a direct replacement for DuPont XLE-440?

Yes. For maximum flow matching the XLE-440, we recommend our WD-XLE-440 model, which features the exact same 440 ft² active area and delivers 12,000 GPD at ultra-low pressure. It is a 100% physical drop-in replacement for any 8.0" FRP pressure vessel.

What is your warranty policy for OEM elements?

We provide a strict 12-Month Limited Warranty against manufacturing defects. The warranty is voided if failure is caused by improper pre-treatment (Feed SDI > 5), exposure to oxidative chemicals (Free Chlorine > 0.1ppm), or operation beyond the 600 PSI limit.

My system is down. How fast can you ship via air-freight?

For standard 8040 elements in stock, we execute emergency DHL/FedEx dispatches within 48 hours. Elements typically arrive globally in 3-7 days, enabling factory operators to immediately restore their core production lines.

How do you guarantee the quality of your OEM membranes before shipping?

Every single WANDONG OEM element undergoes rigorous testing at our 50,000m² ISO 9001 facility. We perform 100% vacuum decay testing for mechanical integrity and batch-test performance (salt rejection and flow rate) according to ASTM D4516 standards. A formal QC certificate is included in every box.

What is the typical lifespan of ULP elements in municipal applications?

With proper pre-treatment (SDI < 3) and regular CIP maintenance, WANDONG ULP elements typically last 3 to 5 years in municipal tap water or light brackish water applications before requiring replacement due to natural flux decay.

// MODULE-16 / INITIATE PROTOCOL

YOUR 50,000m²
OEM SUPPLY BACKEND.

Secure your global supply chain with factory-direct economics. Whether you need a single emergency pallet or a 20ft container for a mega-plant, our engineers will provide a precise drop-in replacement proposal within 1 hour.

1h

INITIAL RESPONSE

1-ON-1

CUSTOM PROPOSAL

$0

CONSULTATION FEE

// SECURE YOUR SUPPLY CHAIN

Request Dispatch & Pricing

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Target Part Number *

Quantity *

Raw Water Report or Old Specs (Optional)

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Notes & Destination Zip Code

Not sure which model fits? We provide comparative proposals showing exact CapEx and OPEX differences.

AVG. RESPONSE: < 4 HRS · NDA AVAILABLE ON REQUEST

Slash OPEX with ULP Elements.

Dual-Track Procurement.Zero Compromise.