FilmTec™ HSRO-4040-FF

Heat Sanitizable Reverse Osmosis Element


General Information

  • Keep elements moist at all times after initial wetting.
  • For successful operation of Reverse Osmosis (RO) and Nanofiltration (NF) membrane systems, the operation must follow the guidelines provided in the FilmTec™ Reverse Osmosis / Nanofiltration Elements Operation Excellence and Limiting Conditions Tech Fact.
  • To prevent biological growth during prolonged system shutdowns, it is recommended that membrane elements be immersed in a preservative solution.
  • The customer is fully responsible for the effects of incompatible chemicals and lubricants on elements.
  • Avoid static permeate-side backpressure at all times.
  • Permeate obtained from the first hour of operation should be discarded.
  • The use of this product in and of itself does not necessarily guarantee the removal of cysts and pathogens from water. Effective cyst and pathogen reduction is dependent on the complete system design and on the operation and maintenance of the system.
  • Avoid any abrupt pressure or cross-flow variations on the spiral elements during start-up, shutdown, cleaning or other sequences to prevent possible membrane damage.
  • During start-up, a gradual change from a standstill to operating state is recommended as follows:
    • – Feed pressure should be increased gradually over a 30-60 second time frame.
    • – Cross-flow velocity at set operating points should be achieved gradually over 15-20 seconds.
  • Suitable quality water must be used during all pre-conditioning steps. This water is chlorine-free, non-scaling/fouling water. RO permeate is preferred, but prefiltered municipal water may be used.



Operating and Cleaning Limits
Membrane Type Polyamide Thin-Film Composite
Maximum Operating Temperature  113°F (45°C)
Maximum Sanitization Temperature (@ 25 psig)  185°F (85°C)
Maximum Operating Pressure  600 psig (41 bar)
Maximum Pressure Drop
Per Element
Per Vessel (Housing)
 15 psig (1.0 bar)
60 psig (4.1 bar)
pH Range
Continuous Operation
Short-Term Cleaning (30 min)
2 – 11
1 – 12
Maximum Feed Silt Density Index (SDI  SDI 5
Free Chlorine Tolerance  < 0.1 ppm