DOW FILMTEC SW30HR LE-4040 Seawater Reverse Osmosis Element

Product Information
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Page 1 of 2 ™® Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow Form No. 609-00479-0811
DOW FILMTEC™ Membranes
DOW FILMTEC SW30HR LE-4040 Seawater Reverse Osmosis Element
Features DOW FILMTEC™ SW30HR LE-4040 reverse osmosis element is a four-inch diameter version
of SW30HR LE-400, the industry’s leading seawater element which offers an unprecedented
combination of high salt rejection and productivity to enable the lowest total cost of purifying
high salinity water.
 SW30HR LE-4040 may be used as a pilot element to demonstrate performance for the
design of larger systems.
 SW30HR LE-4040 delivers the highest sodium chloride and boron rejection to help meet
World Health Organization (WHO) and other drinking water standards.
 SW30HR LE-4040 elements deliver high performance over the operating lifetime without
the use of oxidative post-treatments like many competitive products. This is one reason
DOW FILMTEC elements are more durable and may be cleaned more effectively over a
wider pH range (1-13) than other RO elements.
Product Specifications
Product Part Number
Active Area
Permeate Flow
Rate gpd (m3
Minimum Salt
Rejection %
Stabilized Salt
Rejection %
SW30HR LE-4040 255048 85 (7.9) 1,600 (6.1) 99.60 99.75
1. Permeate flow and salt rejection based on the following test conditions: 32,000 ppm NaCl, 800 psi (5.5 MPa), 77°F (25°C), 8% recovery, pH 8.
2. Permeate flows for individual elements may vary +/-20%.
3. For the purpose of improvement, specifications may be updated periodically.
1. Refer to DOW FILMTEC Design Guidelines for multiple-element systems. 1 inch = 25.4 mm
2. Elements fit nominal 4-inch I.D. pressure vessel.
Dimensions – Inches (mm)
Product Feed Spacer (mil) A B C D
SW30HR LE-4040 28 40.0 (1,016) 1.05 (26.7) 0.75 (19) 3.9 (99)
Operating Limits  Membrane Type Polyamide Thin-Film Composite
 Maximum Operating Temperature 113F (45C)
 Maximum Operating Pressure 1,200 psig (83 bar)
 Maximum Element Pressure Drop 15 psig (1.0 bar)
 pH Range, Continuous Operation 2 – 11
 pH Range, Short-Term Cleaning (30 min.)b 1 – 13
 Maximum Feed Silt Density Index (SDI) SDI 5
 Free Chlorine Tolerance <0.1 ppm
a. Maximum temperature for continuous operation above pH 10 is 95°F (35°C).
b. Refer to Cleaning Guidelines in specification sheet 609-23010.
c. Under certain conditions, the presence of free chlorine and other oxidizing agents will cause premature membrane failure.
Since oxidation damage is not covered under warranty. DOW FILMTEC recommends removing residual free chlorine by
pretreatment prior to membrane exposure. Please refer to technical bulletin 609-22010 for more information.
Figure 1
Page 2 of 2 ™® Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow Form No. 609-00479-0811
Proper start-up of reverse osmosis water treatment systems is essential to prepare the
membranes for operating service and to prevent membrane damage due to overfeeding or
hydraulic shock. Following the proper start-up sequence also helps ensure that system
operating parameters conform to design specifications so that system water quality and
productivity goals can be achieved.
Before initiating system start-up procedures, membrane pretreatment, loading of the
membrane elements, instrument calibration and other system checks should be completed.
Please refer to the application information literature entitled “Start-Up Sequence” (Form No.
609-02077) for more information.
Avoid any abrupt pressure or cross-flow variations on the spiral elements during start-up,
shutdown, cleaning or other sequences to prevent possible membrane damage. During startup, a gradual change from a standstill to operating state is recommended as follows:
 Feed pressure should be increased gradually over a 30-60 second time frame.
 Cross-flow velocity at set operating point should be achieved gradually over 15-20 seconds.
 Permeate obtained from first hour of operation should be discarded.
 Keep elements moist at all times after initial wetting.
 If operating limits and guidelines given in this bulletin are not strictly followed, the limited
warranty will be null and void.
 To prevent biological growth during prolonged system shutdowns, it is recommended that
membrane elements be immersed in a preservative solution.
 The customer is fully responsible for the effects of incompatible chemicals and lubricants
on elements.
 Maximum pressure drop across an entire pressure vessel (housing) is 50 psi (3.4 bar).
 Avoid static permeate-side backpressure at all times.
DOW FILMTEC™ Membranes
For more information about DOW
FILMTEC membranes, call the Dow
Water & Process Solutions business:
North America: 1-800-447-4369
Latin America: (+55) 11-5188-9222
Europe: (+32) 3-450-2240
Pacific: +60 3 7958 3392
Japan: +813 5460 2100
China: +86 21 2301 1000
Notice: The use of this product in and of itself does not necessarily guarantee the removal of cysts and pathogens from water.
Effective cyst and pathogen reduction is dependent on the complete system design and on the operation and maintenance of
the system.
Notice: No freedom from any patent owned by Dow or others is to be inferred. Because use conditions and applicable laws
may differ from one location to another and may change with time, Customer is responsible for determining whether products
and the information in this document are appropriate for Customer’s use and for ensuring that Customer’s workplace and
disposal practices are in compliance with applicable laws and other government enactments. Dow assumes no obligation or
liability for the information in this document. NO WARRANTIES ARE GIVEN; ALL IMPLIED WARRANTIES OF