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Vontron ULP21-4040 4" Reverse Osmosis Membrane Element

The Vontron ULP21-4040 is an ultra-low pressure spiral-wound reverse osmosis membrane element engineered for high-efficiency demineralization in commercial and light-industrial water purification systems. Fabricated with an aromatic polyamide thin-film composite chemistry and an effective active filtration area of 8.4 m2 (90 sq ft), it achieves high permeate productivity and reliable salt separation while operating under approximately two-thirds of the feed pressure required by conventional low-pressure membranes. This ultra-low pressure capability reduces energy consumption and mechanical load on booster pumps, piping, and pressure vessels, lowering overall operational and capital equipment costs.

206.61 € 206.61 € (Tax included)
206.61 € (Tax included)

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Documents
VONTRON ULP21-4040 Passport VONTRON ULP21-4040 Product Data Sheet

Internal Reference: 684210
Barcode: 1872025007222

Optimized for desalinating municipal, tap, surface, and underground water sources with total dissolved solids up to 2,000 ppm, the ULP21-4040 delivers a nominal permeate flow rate of 9.1 m3/day (2,400 GPD / ~0.38 m3/h) with a stabilized salt rejection of 99.0% (minimum 98.5%) under standard test conditions (1,500 ppm NaCl at 10.3 bar). Built in an industry-standard 4040 form factor with an outer fiberglass wrap, molded end caps, and standard 19.1 mm permeate connector stubs, the element provides broad mechanical and chemical compatibility across operating feed pressures up to 41.4 bar and chemical CIP cleanings across pH 2 to 12.

Technical information

Here are most important bullet points about this product.

  • Ultra-Low Pressure Operation: Runs at two-thirds of the operating pressure of standard membranes, cutting high-pressure pump energy consumption and component wear.
  • High Permeate Flow Rate: Delivers an average output of 9.1 m3/day (2,400 GPD / ~0.38 m3/h) to meet demanding commercial purified water requirements.
  • Superior 99.0% Salt Rejection: Aromatic polyamide thin-film barrier layer delivers high removal of dissolved minerals, heavy metals, and inorganic ions.
  • Wide Chemical & CIP Cleaning Tolerance: Operates continuously within pH 3 to 10 and withstands aggressive short-term chemical clean-in-place sanitization from pH 2 to 12.
  • Universal 4040 Geometry: Direct drop-in fit for standard 4-inch commercial reverse osmosis pressure vessels.
  • Durable Structural Wrapping: Reinforced fiberglass outer wrap with molded ABS end caps and brine seal ensures dimensional stability inside high-pressure vessels.
  • Product Type: Ultra-Low Pressure Brackish & Tap Water RO Membrane Element
  • Manufacturer / Model: Vontron / ULP21-4040
  • Country of Origin: China (PRC)
  • Membrane Chemistry: Polyamide Thin-Film Composite (TFC), Spiral-Wound
  • Active Membrane Surface Area: 8.4 m2 (90 sq ft)
  • Feed Spacer Thickness: 28 mil (0.7 mm)
  • Nominal Permeate Flow Rate: 9.1 m3/day (2,400 GPD / ~0.38 m3/h)*
  • Stabilized Salt (NaCl) Rejection: 99.0%*
  • Minimum Salt Rejection: 98.5%*
  • Nominal Test Pressure: 10.3 bar / 150 psi (1.03 MPa)*
  • Standard Test Conditions: 1,500 ppm NaCl solution, 25 deg C, pH 7.5, 15% recovery*
  • Maximum Operating Pressure: 41.4 bar / 600 psi (4.14 MPa)
  • Maximum Feed Water Volume: 3.6 m3/h (16 gpm)
  • Maximum Element Pressure Drop: 0.1 MPa / 1.0 bar (15 psi)
  • Maximum Pressure Drop per Housing (6 elements): 0.34 MPa / 3.4 bar (50 psi)
  • Maximum Feed Water Temperature: 45 deg C
  • Continuous Operating pH Range: 3.0 to 10.0
  • Chemical Cleaning (CIP) pH Range: 2.0 to 12.0
  • Maximum Feed Water SDI15: < 5
  • Maximum Free Chlorine Concentration: < 0.1 ppm (mg/L)
  • Total Overall Length (A): 1,016.0 mm (40.0 inches)
  • Element Outer Diameter (B): 99.7 mm (3.9 inches)
  • Core Tube Inner Diameter (C): 19.1 mm (0.75 inches)
  • Permeate Core Extension Length (D): 26.7 mm (1.05 inches)
  • Weight: 4.3 kg
  • Primary Compatibility: Commercial 4" RO systems (including Ecosoft MO5000, MO10000, MO20000, and standard 4040 housings)

*Note: Permeate flow rate for single elements has a tolerance within +/-15% of the nominal value.

  • Commercial drinking water and beverage production lines
  • Boiler water replenishment and technical steam generation
  • Pharmaceutical and cosmetic process water preparation
  • Commercial car washes and touchless spot-free vehicle rinsing lines
  • Foodstuff and agricultural processing loops
  • Municipal tap, well, and surface water desalination with TDS up to 2,000 ppm

Please note: Adhere strictly to proper system commissioning procedures to protect the membrane from hydraulic shock and overfeeding. Perform an initial low-pressure flush for 15 to 25 minutes, followed by high-pressure circulation for 60 to 90 minutes. Discard all permeate and concentrate generated during the first hour of system operation before redirecting water to pure storage tanks. Keep membrane elements continuously moist after initial wetting, and maintain zero static backpressure on the permeate collection line. For extended system downtime, immerse elements in a 1.0% sodium bisulfite (food-grade) protective solution to inhibit microbial growth.