Bumblebee Linens

Featuring breakthrough membrane chemistry, the DOW™ FILMTEC™ HRLE-440i element delivers the same 99.5% nominal NaCl rejection as traditional brackish water elements but at 33% lower pressures.

• Lower energy requirements allow new reverse osmosis systems to be designed to use one third less energy and still deliver the same permeate quality compared with other BW elements
• Existing low energy systems can be retrofitted to achieve lower permeate TDS than possible with previous low energy elements
• The combination of low energy and high rejection is ideally suited for use in the second pass of seawater and high-purity applications
• Excellent rejection of silica, boron, nitrate and ammonium; supported by Dow’s modeling software
• Increased IPA rejection (IPA rejection is a common surrogate for TOC removal)
• Available dry for longer storage life and easier handling

Product Type
Advanced Polyamide Thin-Film Composite

40 in x 7.9 in

Product Specifications

Flow Rate
Rejection (%)
(psig) (bar) (GPD) (m³/h)
12,650 48.0 99.5
  1. Permeate flow and salt (NaCl) rejection based on the following standard conditions: 2,000 ppm NaCl, 150 psi (10.3 bar), 77°F (25°C), pH 8 and 15% recovery.
  2. Flow rates for individual elements may vary but will be no more than 15% below the value shown.
  3. Sales specifications may vary as design revisions take place.
  4. Active area guaranteed ± 3%. Active area as stated by Dow Water & Process Solutions is not comparable to nominal membrane area often stated by some manufacturers. Measurement method described in Form No. 609-00434.
  5. Specific solute stabilized rejections based on the following standard test conditions: 2,000 ppm NaCl, 150 psi (10.3 bar), 77°F (25°C), pH 7 and 15% recovery, 50 ppm SiO2, 5 ppm B, 100 ppm NO3-, 100 ppm NH4+, or 100 ppm IPA.

Operating and Cleaning Limits

Operating Temperature
Operating Pressure
Feed Flow
Pressure Drop
pH Range,
Continuous Operation
pH Range,
Short-Term Cleaning (30 min.)
Maximum Feed
Silt Density
Index (SDI)
113°F (45°C) 600 psig (41 bar) 85 gpm (19.0 m³/h) 15 psig (1.0 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, DOW FILMTEC recommends removing residual free chlorine by pretreatment prior to membrane exposure. Please refer to technical bulletin 609-22010 for more information.