Bumblebee Linens

Dow Water Solutions offers various premium seawater Reverse Osmosis (RO) elements which combine premium membrane performance with automated precision fabrication and maximize system output to unprecendented performance.

FILMTEC™ SW30ULE-400i is an element with one of the highest flow rates in the industry, and high rejection of NaCl and boron. This performance can lead to significant capital and operation cost savings, especially when this element is mixed with other element types in the same pressure vessel, using the “internally staged design” approach. The benefits of the FILMTEC SW30ULE-400i elements include:
• One of the highest seawater element flowrates in the industry. This may lead to lower capital and operation cost in a seawater system.
• High NaCl and boron rejection to help meet World Health Organization (WHO) and other drinking water standards.
• Effective use in permeate staged seawater desalination systems without impairing the performance of the downstream stage.
• High performance over the operating lifetime without the use of oxidative posttreatments.
• Automated, precision fabrication with a greater number of shorter membrane leaves reduces the effect of overall fouling and maximizes element efficiency.

Product Type
Polyamide Thin-Film Composite

40 in x 7.9 in

Product Specifications

Flow Rate
Rejection (%)
Rejection (%)
(psig) (bar) (GPD) (m³/h)
8,400 31.8 86.4 99.6
  1. The above benchmark values are based on the following test conditions: 32,000 ppm NaCl, 700 psi (5.5 MPa), 77°F (25°C), pH 8 and 8% recovery.
  2. Permeate flows for individual elements may vary ± 15%.
  3. Minimum Salt Rejection is 99.50%.
  4. Stabilized salt rejection is generally achieved within 24 – 48 hours of continuous use; depending upon feedwater characteristics and operating conditions.
  5. Product specifications may vary slightly as improvements are implemented.

Operating and Cleaning Limits

Operating Temperature
Operating Pressure
Pressure Drop
pH Range,
Continuous Operation
pH Range,
Short-Term Cleaning (30 min.)
Maximum Feed
Silt Density
Index (SDI)
113°F (45°C) 1,200 psig (83 bar) 13 psig (0.9 bar) 2 – 11 1 – 13 SDI 5 < 0.1 ppm

• Maximum temperature for continuous operation above pH 10 is 95°F (35°C).
• Refer to Cleaning Guidelines in specification sheet 609-23010.
• 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. FilmTec Corporation recommends removing residual free chlorine by pretreatment prior to membrane exposure. Please refer to technical bulletin 609-22010 for more information