RO Membrane Elements

RO Membrane Elements

RO Membranes

Puritech has a widest range of RO Membranes with the above mentioned being the top selling one. 
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Reverse Osmosis membranes are typically capable of removing 90%–99% of contaminants such as total dissolved solids (TDSs) in the water supply. The membranes are usually manufactured as a flat sheet of thin composite membranes consisting of an active polyamide layer (high permeability but impermeable to dissolved salts and particulate matter) supported by a porous polysulphone layer wound round a central collection tube

Vontron Membranes

Puritech Membranes

E-MEM 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%.

Membrane Dimensions:

Model No.A (inch/mm)B (inch/mm)C (inch/mm)

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.

Operating Limits:

Model No.Maximum Operating TemperatureMaximum Operating PressureFeed Water PH Range, continuous operation *Maximum Feed Water TurbidityMaximum Feed Water SDIChlorine tolerance

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

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