February 17, 2020 - Nathan Olszak


Innovative Chlorine Resistant RO Element for Prolonged Membrane Lifetime


General Features

Permeate flow rate Nominal salt rejection Stabilized salt rejection Effective membrane area Feed spacer thickness
12,000 GPD (45.4 m3/day) 96% 99% 400 ft2 (37.2 m2) 32 mil
  1. The stated product performance is based on data taken after 30 minutes of operation at the following test conditions:
    • 2,000 mg/L NaCl solution at 225 psig (1.5 MPa) applied pressure
    • 15% recovery
    • 77°F (25°C)
  2. Minimum salt rejection is 99.0%.
  3. Permeate flow rate for each element may vary but will be no more than 15%.
  4. All elements are vacuum sealed in a polyethylene bag containing 1.0% SBS (sodium bisulfite) solution and individually packaged in a cardboard box.
  • Salt rejection has a tendency to increase until 300ppm-hr of free chlorine exposure
  • Maximum Chlorine Exposure Limit 5,000ppm-hr (After 5,000 ppm-hr of free chlorine exposure, expect salt passage to double from its initial value)
  • Test Conditions: Equivalent to standard conditions stated above
Membrane type Membrane material Element configuration
Thin-Film Composite Polyamide (PA) Spiral-Wound, FRP Wrapping

Dimensions and Weight

Model Name A B C Weight Part Number (Inter-connector) Part Number (Brine Seal)
RE8040-CE 40.0 (1,016) 8.0 (201) 1.12 (28) 15 kg 40000308 40000309

* All measurements are in inches (millimeters).

  1. Each membrane element supplied with one brine seal, one interconnector (coupler) and four o-rings.
  2. All RE8040 elements fit nominal 8.0 inch (201 mm) I.D. pressure vessels.

The information provided in this document is solely for informative purposes. It is the user’s responsibility to ensure the appropriate usage of this product. Toray Chemical Korea Inc. assumes no obligation, liability or damages incurred for the misuse of the product or for the information provided in this document.This document does not express or implies any warranty as to the merchantability or fitness of the product.

Application Data

Operation Limits

Max. Pressure Drop / Element
15 psi (0.1 MPa)
Max. Pressure Drop / 240″ Vessel
60 psi (0.41 Mpa)
Max. Operating Pressure
600 psi (4.14 MPa)
Max. Feed Flow Rate
75 gpm (17.0 m3/hr)
Min. Concentrate Flow Rate
16 gpm (3.6 m3/hr)
Max. Operating Temperature
113 oF (45 oC)
Operating pH Range
CIP pH Range
Max. Turbidity
1.0 NTU
Max. SDI (15 min)
Max. Chlorine Concentration
< 0.1 mg/L

Design Guidelines for Various Water Sources

Wastewater Conventional (SDI < 5)
8-12 gfd
Wastewater Pretreated by UF/MF (SDI < 3)
10-14 gfd
Seawater, Open Intake (SDI < 5)
7-10 gfd
Seawater, Beach Well (SDI < 3)
8-12 gfd
Surface Water (SDI < 5)
12-16 gfd
Surface Water (SDI < 3)
13-17 gfd
Well water (SDI < 3)
13-17 gfd
RO permeate (SDI < 1)
21-30 gfd

Saturation Limits (Using Antiscalants)✝

Langlier Saturation Index (LSI)
Stiff and Davis Saturation Index (SDSI)
230% saturation
800% saturation
6,000% saturation
100% saturation

✝The above saturation limits are typically accepted by proprietary antiscalant manufacturers. It is the user’s responsibility to ensure proper chemical(s) and concentration are dosed ahead of the membrane system to prevent scale formation anywhere within the membrane system. Membrane elements fouled or damaged due to scale formation are not covered by the limited warranty

  • Elements contained in the boxes must be kept dry at room temperature (7-32=°C; 40-95°F) and should not be stored in direct sunlight. If the polyethylene bag is damaged, a new preservative solution (sodium bisulfite) must be added and air-tight sealed to prevent drying and biological growth.
  • Permeate from the first hour of operation should be discarded to flush out the preservative solution.
  • Elements should be immersed in a preservative solution during storage, shipping and system shutdowns to prevent biological growth and freezing. The standard storage solution contains 1% by weight sodium bisulfite or sodium metabisulfite (food grade). For short term storage (i.e. one week or less) 1% by weight sodium metabisulfite solution is adequate for preventing biological growth.
  • Keep elements moist at all times after initial wetting.
  • Avoid excessive pressure and flow spikes.
  • Only use chemicals compatible with the membrane elements and components. Use of such chemicals may void the element limited warranty.
  • Permeate pressure must always be equal or less than the feed/concentrate pressure. Damage caused by permeate back pressure voids the element limited warranty.


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