Puritech Membranes

About Puritech Membranes

PURITECHTM Industrial Membrane ranks the best brands in South Africa among the TFC RO membrane industry. Each membrane is made of a world brand quality sheet and goes through stringent manufacturing processes as well as in-house quality inspection & testing before delivery. TW2540/4040/8040 series RO membranes are widely used for filtration of tap water, underground water & brackish water; we well serve the industries including commercial drinking/food water treatment, electronics & chemical works, power plant, etc.

Puritech Membranes

How The Reverse Osmosis Membrane Works

Main Features:

  • PURITECHTM anti-fouling & high rejection flat sheet (film);
  • lower energy costs (low pressure models) and higher productivity;
  • high stabilized rejection with realized nominal flux;
  • minimize system CAPEX with PURITECHTM RO membrane excellent performance-price ratio;
  • stringent in-house inspection & testing control.

Performance Specifications:

Model No. Min. Salt Rejection (%) Stabilized Salt Rejection (%) Permeate Flow Rate (gpd) Test Pressure (PSI)  Test water NaCl (PPM)
TW-2540HF 96.5 97 800 120 750
TW-4040HF 97.5 98 2400 150 750
TW-8040HF 97.5 98 10500 150 750
  1. Permeate flow rate and salt rejection is based on testing conditions: 25⁰C, pH 7.5, 25% recovery.
  2. Stabilized salt rejection is generally achieved within 24-48 hours of continuous use, depending upon feedwater characteristics and operating conditions.
  3. Active area guaranteed +/- 3%.

Operating Limits:

Model No.Maximum Operating TemperatureMaximum Operating PressureFeed Water PH Range, continuous operation *Maximum Feed Water TurbidityMaximum Feed Water SDIChlorine tolerance
TW-2540HF45℃600psig2-111NTU5<0.1ppm
TW-4040HF45℃600psig2-111NTU5<0.1ppm
TW-8040HF45℃600psig2-111NTU5<0.1ppm

* for short term cleaning (30 min.): 1-13

Membrane Dimensions:

Model No.A (inch/mm)B (inch/mm)C (inch/mm)
TW-2540HF2.5/63.540/10160.74/18.9
TW-4040HF4.0/100.140/10160.75/19.1
TW-8040HF8.0/203.240/10161.125/28.6

General Information:

To ensure proper startup of RO water treatment systems is essential to prepare the membranes for operating service and to prevent membrane damage due to overfeeding or hydraulic shock. Following the proper startup procedure (available with water treatment system guide book) also helps ensure that system operating parameters conform to design specifications so that system water quality and productivity goals can be achieved. Before initiating system startup procedures, membrane pretreatment, loading of the membrane elements, instrument calibration and other system checks should be completed.

Operation Guidelines:

It is CRITICAL to avoid any abrupt pressure or cross-flow variations on the RO membrane elements during start-up, shutdown, cleaning, or other sequences to prevent possible membrane damage. During startup, a gradual change from a standstill to an operating state is recommended as follows:

  • Feed pressure should be increased gradually over a 30-90 second time frame.
  • Cross-flow velocity at set operating point should be achieved gradually over 15-30 seconds.
  • Permeate obtained from the first hour of operation should be discarded.

Important Information:

Keep RO membrane elements moist at all times after initial wetting. If operating limits and guidelines given in this specification are not strictly followed, the limited warranty with the supplier will be null and void. To prevent biological growth during prolonged system shutdowns, it is recommended that RO membrane elements be immersed in a storage solution. The customer is fully responsible for the effects of incompatible chemicals and lubricants on elements. The maximum pressure drop across an entire pressure vessel (housing) is 50 psi (3.4 bar). Avoid static permeate-side backpressure at all times.

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