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ULP Membrane

UMEK as a UMEKCH®-water treatment chemical company, UMEKM®-water treatment components manufacturer, UEMKE®-water treatment engineering company, UMEKS®-water treatment products sales company as one company,We have more than 25 years of experience,200+ worker,120+ export country. UMEKM® RO (reverse osmosis) membrane is widely used in Bottled water, municipal drinking water, industrial pure water, electronic high-purity water, seawater desalination, brackish water treatment, wastewater reuse, food and beverage, pharmaceutical and chemical industry, power plant water treatment, cooling water treatment, etc.

2.2.2 UMEK lU Series of Membrane Element

Brief Introduction

IU series of ultra-low pressure aromatic polyamide compound membrane element can work under ultra-low pressure to reach as high permeate flow and salt rejection as regular low-pressure membrane element can, and is applicable to desalination of surface water and underground water. It operates under approximately 2 thirds of the operating pressure of regular low-pressure composite membrane, and achieves a salt rejection rate of up to 99.0%, which can decrease the investment costs for such relevant facilties as pump, piping, and container, etc. and the operating cost for the RO system, thus increasing the economic efficiency.

Being suitable for the desalting treatment of those water sources with salt concentration lower than 2000 ppm, such as surface water, underground water, tap water and municipal water, etc., IU series membrane elements are mainly applicable to numerous applications of various scales, such as pure water, boiler water replenishment, foodstuff processing, and pharmaceutical production, etc.

Specifications and Major Properties


Average Permeated Flow GPD (m3/d)

Stable Rejection Rate (%)

Minimum Rejection Rate (%)

















Testing Conditions: 

Testing Pressure: 150 psi (1.03Mpa)

Temperature of Testing Solution: 25°C

Concentration of Testing Solution (NaCl): 1500ppm

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 Temperature: 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)

Important Information

Any specific application must be limited within the extreme operating conditions. We strongly recommend you to refer to the latest edition of technology manual and design guide prepared by Hebei UMEK Environment Machine Co., Ltd. or consult experts proficient in membrane technology. 

In case the customer fails to follow the operating conditions as specified in this manual, Hebei UMEK Environment Machine Co., Ltd. will assume no liability for all results. The permeate flow listed in the table is the average value.

The permeate flow of single membrane element is within a tolerance not exceeding ±20% of the nominal value. All wet-type membrane elements have been strictly tested before leaving the factory, and have been treated with the solution of 1.0% sodium hydrogen sulfite (an antifreeze solution of 10% propanediol required in winter) for storage purpose, then sealed with plastic bag in vacuum, and further packed in carton boxes.

 In order to prevent the breeding of microbes during short-time storage, transportation and system standby, we recommend you to soak the membrane elements with protective solution (prepared with RO filtered water) containing 1.0% sodium hydrogen sulfite (foodstuff-purpose). Discard the RO-filtered water produced during the first one hour after system start-up. 

During storage time and run time, it is strictly prohibited to dose any chemical medicament that may be harmful to membrane elements. In case of any violation in using this kind of chemical medicament, Hebei UMEK Environment Machine Co., Ltd. assumes no liability for any outcome incurred herefrom.