Bumblebee Linens

DOW FILMTEC™ reverse osmosis (RO) elements offer the highest quality water for small commercial systems purifying less than one gallon per minute (0.2 m³/d) of RO water.

• DOW FILMTEC membranes are available in a variety of sizes to meet a wide range of space requirements.
• DOW FILMTEC XLE extra low energy elements operate at the lowest pressure in the industry, resulting in lower energy costs and enabling system builders to use lower cost components.
• In addition to the highest quality water and the lowest energy costs, DOW FILMTEC membranes also deliver savings by providing the industry’s longest lasting and most reliable performance.

Product Type
Polyamide Thin-Film Composite

14 in x 3.9 in

Product Specifications

Flow Rate
Rejection (%)
(psig) (bar) (GPD) (m³/h)
 225  15.5 525 1.99 99.5
  1. Permeate flow and salt rejection based on the following test conditions: TW30 elements are tested on a 2,000 ppm NaCl feed stream, XLE performance based on a 500 ppm NaCl feed stream, pressure specified above, 77°F (25°C) and the following recovery rates; TW30-2026 – 10%, TW30-2521, XLE-2521, TW30-4021, XLE-4021 – 8%, TW30-2514, TW30-4014 – 5%.
  2. Permeate flows for individual elements may vary ±20%.
  3. For the purpose of improvement, specifications may be updated periodically.

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) 600 psig (41 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, DOW FILMTEC recommends removing residual free chlorine by pretreatment prior to membrane exposure. Please refer to technical bulletin 609-22010 for more information.