FILMTEC™ BW30-400/34


IIdeal for: reverse osmosis plant managers and operators dealing with challenging waters and wastewaters and looking for consistency, high performance, long element life, increased productivity and low fouling features.

Offering proven performance, DOW FILMTEC™ BW30-400/34:

  • Delivers high quality permeate water while minimizing CAPEX
  • Offers one of the most effective cleaning performance, robustness and durability due to its widest cleaning pH range (1 – 13) tolerance and the support of Dow technical representatives

Product Type

Spiral-wound element with polyamide thin-film composite membrane

Product Specifications

DOW FILMTEC™ ElementActive Area (ft2)Active Area (m2)Feed Spacer Thickness (mil)Permeate Flow Rate (GPD)Permeate Flow Rate
Typical Stabilized Salt Rejection (%)Minimum Salt Rejection (%)

1. Permeate flow and salt (NaCl) rejection based on the following standard test conditions: 2,000 ppm NaCl, 225 psi (15.5 bar), 77°F (25°C), pH 8, 15% recovery.
2. Flow rates for individual elements may vary but will be no more than 15% below the value shown.
3. Stabilized salt rejection is generally achieved within 24-48 hours of continuous use; depending upon feedwater characteristics and operating conditions.
4. Sales specifications may vary as design revisions take place.
5. 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.

Element Dimensions

DOW FILMTEC™ Element(in.)(mm)(in.)(mm)(in.)(mm)
BW30–40040.01,0161.125 ID29 ID7.9201

1. Refer to Dow Water & Process Solutions Design Guidelines for multiple-element applications. 1 inch = 25.4 mm
2. Element to fit nominal 8-inch (203-mm) I.D. pressure vessel.

Operating and Cleaning Limits

Maximum Operating Temperature a113°F (45°C)
Maximum Operating Pressure600 psig (41 bar)
Maximum Element Pressure Drop15 psig (1.0 bar)
pH Range, Continuous Operation a2 – 11
pH Range, Short-Term Cleaning (30 min.) b1 – 13
Maximum Feed Silt Density Index (SDI)SDI 5
Free Chlorine Tolerance c< 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 Water & Process Solutions recommends removing residual free chlorine by pretreatment prior to membrane exposure. Please refer to technical bulletin "Dechlorinating Feedwater" for more information.

Additional Important Information

Before use or storage, review these additional resources for important information: