ULP series of ultra-low pressure aromatic polyamide compound RO membranes can work under ultra-low pressure to reach the same permeate flow and rejection as of regular low-pressure membrane elements. ULP series can be effectively used for desalination of surface water (NaCl ≤2000ppm), underground water, tap water, and municipal water.
ULP membrane elements are mainly used for boiler water replenishment, foodstuff processing, and pharmaceutical production. Effective operation at a lower pressure can decrease the investment costs for related equipment such as pumps, pipelines, and containers, etc. and the operating cost for the RO system, thus increasing the economic efficiency.
Technical specifications of ULP22-8040 RO membrane
Active membrane area, sq.ft (sq.m)
Average permeate, GPD (cu.m/d)
12 100 (45,7)
Stable rejection rate, %
Min. rejection rate, %
150 psi (1,03 MPa)
Testing solution temperature
Testing solution concentration (NaCl)
1 500 ppm
Testing solution pH value
Recovery rate of a single membrane element
Operation Limits & Conditions
Max. working pressure
600 psi (4,14 MPa)
Max. feed water supply volume
75 gpm (17 m3/h)
Max. feed water temperature
Max. feed water SDI15
Feed water pH Range during continuous operation
3 ≈ 10
Feed water pH Range during chemical cleaning
2 ≈ 12
Feed water residual chlorine concentration
< 0,1 ppm
Max. pressure drop on a single membrane element
15 psi (0,1 MPa)
Max. pressure drop on a single pressure vessel with six RO membrane elements
50 psi (0,34 MPa)
Notes and Recommendations
1. All data and information provided on this site have been obtained from a long-term experiment by the manufacturer of the membrane elements. The manufacturer assumes no liability for any outcomes caused by the user’s failure to abide by the conditions of use and maintenance specified in the product manual. It is strongly recommended that the user strictly follows the designed use and maintenance requirements and keeps relevant records.
2. The permeate value listed in the table is the average value. The permeate flow of a single membrane element has a tolerance not exceeding ±15% of the nominal value.
3. All wet-type membrane elements have been strictly tested before leaving the factory, and have been treated with 1.0% sodium hydrogen sulfite (10% glycerin antifreeze required in winter) for storage purpose, then sealed with a plastic bag in a vacuum, and further packed in cardboard boxes.
4. After being used the membrane element should remain wet. To prevent the breeding of microbes in the idle membranes, it is recommended to soak the membrane elements with a protective solution of 1.0% sodium hydrogen sulfite (foodstuff -purpose) prepared with RO-filtered water.
5. Conduct low-pressure flushing for 15-25 minutes of first use, then high-pressure flushing for 60-90 minutes when first used (with permeate volume no less than 50% of designed volume). Discard all the permeate and condensed water produced during the first hour after the system start-up.
6. During storage time and operation period, it is strictly prohibited to add any chemicals that may be harmful to membrane elements. In case of any violation in adding chemicals, the manufacturer assumes no liability for any incurred damage.
7. Along with technical development and product renovation, all information will be subject to modification without prior notification.