ULP11-4040 Ultra-Low-Pressure RO Membrane – 4″ × 40″

The ULP11-4040 Reverse Osmosis Membrane is an ultra-low-pressure membrane element designed for efficient water purification in commercial and light-industrial RO systems. Its standard 4-inch × 40-inch configuration supports installation in compatible 4040 membrane housings and multi-element reverse osmosis equipment.

Engineered to deliver dependable permeate production at lower operating pressure than many conventional low-pressure membrane elements, the ULP11-4040 can help reduce system energy requirements while maintaining effective dissolved-solids rejection. Its spiral-wound membrane construction provides a substantial filtration surface within a compact commercial format.

The membrane is suitable for treating compatible low-salinity feedwater sources, including appropriately pretreated municipal water, groundwater, and surface water. Common applications include commercial drinking-water production, process-water purification, food and beverage operations, boiler-feed pretreatment, laboratory systems, spot-free rinse equipment, and general commercial water treatment.

Proper pretreatment is essential for protecting the membrane from suspended solids, scaling, organic fouling, and oxidizing chemicals. Confirm the feedwater chemistry, system pressure, membrane-housing compatibility, pretreatment requirements, and manufacturer operating limits before installation.

Technical Specification

Testing Conditions

Testing Pressure: 150 psi (1.03MPa)

Testing Solution Temperature: 25 ℃

Concentration of Testing Solution (NaCl): 1500ppm

pH value of Testing Solution: 7.5

Recovery Rate of Single Element: 15%

Operation Limits & Conditions

Max. Working Pressure: 600psi（4.14MPa)

Max. Volume of Feed Water: 16gpm（3.6 m3/h）

Max. Temperature of Feed Water: 45℃

 Max. Feed water SDI15: 5

pH Range of Feed Water during Continuous Operation: 3～10

pH Range of Feed Water during Chemical Cleaning: 2～12

Residual Chlorine Concentration of Feed Water : ＜0.1ppm

Max. Pressure Drop of Single Membrane Element: 15psi（0.1MPa）

Max. Pressure Drop of Single Pressure Vessel with Six RO Membranes: 50psi（0.34MPa）

Shipping Information

Optimal Purity Solutions is committed to fast, reliable, and professional fulfillment for our authorized dealer network.

Fulfillment & Processing

• Order Processing: Most in-stock orders ship within 1–2 business days

• Custom/OEM Builds: Lead times vary by configuration; your sales representative will confirm timelines

Shipping Coverage

• Domestic: Nationwide shipping throughout the United States

• International: Available for qualified distributors (terms and transit times vary)

Carriers & Methods

• Shipments are sent via trusted national freight and parcel carriers

• LTL/FTL freight available for pallets and bulk orders

• Expedited shipping options available upon request

Packaging & Handling

• Products are professionally packaged to protect against damage in transit

• Palletized and freight shipments are secured and labeled to industry standards

Tracking & Support

• Tracking information is provided once your order ships

• Our logistics team is available to assist with routing, delivery coordination, and special requirements

Important Notes

• Shipping costs are calculated based on weight, dimensions, destination, and service level

• Damages or discrepancies must be reported within 48 hours of delivery

• Products are sold exclusively through authorized water treatment dealers and partners