PWG RO Membrane 4021

£410.00 Incl. VAT

Our PWG 4021 RO membranes are low pressure,  low energy membranes capable of permeate flow rates up to 181 litres per hour. Suitable for use with 4” x 21” membrane housings, or as a retrofit for RO systems that utilise 4021 membranes. Offering an impressive rejection rate of 99% with a max operating pressure of 20.7 bar (300PSI).

Product Features
  • Energy efficient membrane with high production rate
  • Suitable retrofit for other 4021 RO membranes
  • Production rates of up to 171 litres per hour
  • Average rejection rate of 99%
Choosing RO Membrane
When selecting an RO membrane you should ensure that your application parameters meet the feed requirements stipulated to ensure optimum performance and water quality. You should consider things such as feed pressure, permeate flow (production rate) and rejection rates. For help choosing or cross-referencing a suitable membrane please speak to a member of our team.
Help & Advice
Need help or advice on which size to choose? No problem, drop us an email, start a live chat or give us a call on 01622 933 853 and we’ll be sure to help.

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PWG RO Membrane 4021
PWG RO Membrane 4021
£410.00 Incl. VAT
SKU: PWG-4021ND Category: Tag:

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PWG RO Membrane 4021
PWG RO Membrane 4021
£410.00 Incl. VAT
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PWG RO MEMBRANES

Low Energy 4021 Membrane

PWG’s range of RO membranes has been developed with energy efficiency in mind, whilst maintaining high production and rejection rates to produce excellent quality RO water. As a low energy membrane it can operate at pressures as low as 6.9 bar or as high as 20.7 bar, making it a suitable alternative to Oltremare LOW1-4021, Hydranautics ESPA1-4021, Axeon HF1-4021 and Dow/Filmtec LE-4021 membranes.

Why Choose PWG 4021 RO Membranes?

  • Suitable alternative to other 4021 RO membranes
  • Designed for use in light commercial systems
  • High operating temperature up to 45⁰C
  • Supplied tape wrapped with brine seal
  • Compatible with most 4021 housings

Compatible Products:
Commercial RO Systems
Stainless Steel RO Membrane Housings

Product Resources:
PWG RO Membranes Data Sheet →

Reverse Osmosis Solutions

We’re pleased to offer a comprehensive range of reverse osmosis solutions, from full systems to replacement membranes and accessories. Can’t find exactly what you’re looking for? Get in touch with a member of our team today.

Browse all Reverse Osmosis solutions →

Reverse Osmosis Solutions

Additional Information

Brand

Dimensions

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

Weight

1.8kg

Permeate Flow

181 litres per hour

Average Rejection Rate

99%

Pressure Drop

0.7 Bar

Max Operating Temperature

45°C

Max Operating Pressure

20.7 Bar (300 PSI)

pH Range

3-10


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Pete Cossar
7 October 2026
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Very pleased with the service. There was an issue with the water softener I ordered initially, but then following communications made the replacement process quite pleasant. Happily recommend this company. Thanks to Becky for working with me. Great follow up support 😊😊😊
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Michael Fey
2 October 2026
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Very Pleased with the services from the Sales Team
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Guy Brennan
26 September 2026
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First time using this company and product and i wasnt dissappointed. Communication was easy and quick resulted in an easy order and now having fitted the filter i can say its a great product easy to install and appears good quality apart from the four mild steel bracket screws stainless would have been better considering the environment these are fitted. All in all, very pleased and would highly recommend .
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Graham Quinn
25 September 2026
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Easy to order and fast delivery
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Steve Griggs
14 September 2026
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Excellent local company and genuinely lovely people to deal with. Really helpful and knowledgeable, with great advice about my water softener and the correct salt to use. They even gave me some resin cleaner at no charge, which was a very kind gesture. Fantastic friendly service and I’ll definitely be returning for my salt in future. Highly recommended.
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Don Carless
7 September 2026
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Excellent service. Product proved my softener was not working as it should. I fully serviced it and cleaned with Resin Clean returned to service and it is now working as designed. Very pleased.
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J P
27 August 2026
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If you're thinking about a water softener then i HIGHLY recommend Ultra Soft Water Softeners Ltd. Great softeners and exceptional customer service. The water softener I bought needed some adjustments with the installation setup where I supported throughout. The customer service is honestly next level. I had countless calls with Becky Gillett, the Sales Manager, over a period of months to get to the bottom of it. She was incredibly patient with me, staying on the phone and doing video calls to walk me through the programming instructions step-by-step while I changed the settings and ensured all was installed correctly. All the staff here have been great, but Becky really stuck with me from start to finish to make sure it was sorted and working well. It runs like a dream now. HIGHLY recommend them!
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Chris Collins
26 August 2026
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Easy to order, good prices and delivered on time. What more can you ask for.
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John L
26 August 2026
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Good rapid & efficient service
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Tony Hybel
17 August 2026
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Easy to order, quick delivery, good communication. Resclean worked a treat; one treatment cycle and soft water is back again from our 12 yr old softener!