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Industrial Drinking Water Treatment Reverse Osmosis RO Membrane

The 4040 ultra-low pressure membrane has low operating pressure, high water production, high desalination and desilication rates, saving system operating costs and equipment investment, while maintaining all the advantages of the composite membrane.

Brief Introduction

Ultra low pressure membrane 4040 has good chemical stability, low pressure composite membrane and ultra low pressure composite membrane is the ideal reverse osmosis membrane for the preparation of high purity water today, compared with conventional RO membrane, it has the same high desalination rate and high water flux under low pressure. In addition, due to its neutral surface potential, it is more hydrophilic and resistant to contamination, and therefore has superior performance in the treatment of wastewater containing surface active substances that cause membrane fouling.

Specifications and Major Properties


Average Permeated Flow GPD (m3/d)

Stable Rejection Rate (%)

Minimum Rejection Rate (%)

IWL 21-8040 10000(37.8) 99.5 99.2
IML 22-8040 1 1000(41.5) 99.5 99.2
IWL 21-4040 2500(9.4) 99.5 99.2

Testing Conditions:

Testing Pressure: 225 psi (1.55Mpa)

Temperature of Testing Solution: 25°C

Concentration of Testing Solution (NaCl): 2000ppm

pH Value of Testing Solution: 7.5

Recovery Rate of Single Membrane Element: 15%

Extreme Operation Conditions

Max. Working Pressure: 600psi(4. 14Mpa)

Max. Feedwater Flow: 75gpm(17 m3/h) (8040)

16gpm (3.6 m3/h) (4040)

Max. Feedwater T emperature: 45°C

Max. Feedwater SDI: 5

Residual chlorine Concentration of Feedwater: < 0.1ppm

pH Range of Feedwater during Continuous Operation: 3~10

pH Range of Feedwater during Chemical Cleaning: 2~12

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

Dimensions of Membrane Element

All dimensions are shown in: millimeter (inch)

Dimensions of Membrane Element (1)

Dimensions of Membrane Element (2)


1) High water flux and high desalination rate.

2)Good chemical stability (pH 2-12).

3)Long service life.

4)Resistant to biological contamination.

5)Wide range of pressures available (20-1000psi).

6)Wide range of temperatures (4°C-45°C).

7)Good economy.