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PWG RO Membrane 4021


Our PWG 4021 RO Membranes are designed to suit both our Light Commercial RO System and to retrofit 4” x 21” RO Membranes in other systems. These low energy membranes can produce up to 171 litres per hour of RO water and offer an impressive rejection rate of 99%.

Why Choose Our PWG 4021 RO Membranes?

  • Energy efficient without compromising production
  • Suitable retrofit for other 4021 RO membranes
  • Production rates of up to 171 litres per hour
  • Average rejection rate of 99%

Need help with our PWG 4021 RO Membranes? Give us a call on 01622 933 853


The PWG 4021 RO Membrane has been developed with energy efficiency in mind whilst maintaining high production and rejection rates, producing excellent quality RO water. As a low energy membrane it can operate at pressures as low as 6.9 bar, making it a suitable alternative to Oltremare LOW1-4021, Hydranautics ESPA1-4021, Axeon HF1-4021 and Dow/Filmtec LE-4021 membranes.

Key Product Information

  • Alternative to other market leading 4021 membranes
  • Designed for use in light commercial RO systems
  • High operating temperatures of up to 45⁰C
  • Supplied tape wrapped and with brine seal
  • Suits most 4021 membrane housings

Compatible Products

Need help with our PWG 4021 RO Membranes? Give us a call on 01622 933 853



ATD Diameter 100.3mm, Connection Diameter 19.1mm, Core Tube Feed Size 30.5mm, Length 533.4mm



Permeate Flow

181 litres per hour

Average Rejection Rate


Pressure Drop

0.7 Bar

Max Operating Temperature


Max Operating Pressure

20.7 Bar (300 PSI)

pH Range



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