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Hydranautics RO Membrane 4040


We offer the choice of two Hydranautics 4040 RO Membranes – ESPA4-4040 and ESPA1-4040. Both of these energy saving membranes fit standard 4” x 40” membrane housings and offer optimal performance at lower pressures without compromising the standard for high rejection. The ESPA4-4040 offers an average stabilised rejection rate of 99.2% and the ESPA1-4040 offers an average stabilised rejection rate of 99.3%. More detailed information including which membranes these are suggested alternatives to is below.

Why Choose Our Hydranautics RO Membranes 4040?

  • Suitable for all standard 4” x 40” membrane housings
  • High nominal rejection rates of up to 99.6%
  • Energy saving low pressure membranes
  • Genuine Hydranautics products

Need help with our Hydranautics RO Membranes 4040? Give us a call on 01622 933 853


Hydranautics ESPA (Energy Saving Polyamide) elements are specifically designed as a high flux/low pressure range of membranes. They deliver high rejection rates at lower operating pressures, saving on energy costs.

The ESPA4-4040 is a high rejection, extra low energy membrane that can run at operating pressures as low as 6.9 bar. It is a suitable alternative membrane to LG BW 4040 UES, Axeon HF4-4040 and Dow/Filmtec XLE-4040.

The ESPA1-4040 is a low energy, high production membrane that can run at operating pressures as low as 10 bar. It is a suitable alternative membrane to LG BW 440 ES, Axeon HF1-4040 and Dow/Filmtec LE-4040.

Key Product Information

  • High permeate flow rates of up to 9,800 Litres Per Day
  • Suitable alternatives to other 4040 RO membranes
  • Popular for commercial and industrial applications
  • High operating temperatures of up to 45⁰C
  • ESPA® (Energy Saving Polyamide)

Compatible Products

Need help with our Hydranautics RO Membranes 4040? Give us a call on 01622 933 853



ATD Diameter 100.3mm, Connection Diameter 19.1mm, Length 1016mm



Permeate Flow

ESPA4-4040: 9.46m³/day
ESPA1-4040: 9.8m³/day

Average Rejection Rate

ESPA4-4040: 99.2%
ESPA1-4040: 99.3%

Pressure Drop

10 PSI Per Element

Max Operating Temperature


Max Operating Pressure

600 PSI

Membrane Active Area


pH Range



Resources Available For This Product:

Excellent service highly recommend will use again
David Keys
David Keys
Prompt delivery and a great product
Brian O'Neill
Brian O'Neill
Great service. It’s was delivered very quickly! Highly recommend!
Lovely company to deal with and prompt delivery. I'm in the scottish highlands and they recognised that post is better than courier for rural deliveries.
A wide range of filters ( and UV bulbs) available. Extremely prompt delivery at a very competitive price. Great follow up customer care too.
George Santis
George Santis
Ordered two wound sediment filters which I found to be a very good quality products and very fast delivery. Extremly friendly customer service. I recomend to anyone.
Alistair MacLean
Alistair MacLean
I bought the wound sediment filters. I found the filters arrived very quickly. It was later followed by a courtesy call to make sure the product was received and correct. Just fitted the filter and it is working very well. Very friendly customer service, would not hesitate to reorder from them in the future.
Joe Bloggs
Joe Bloggs
NOT JUST excellent, but also highly technically competent, customer service, all served up with courtesy and good humour. To be recommended without fear or favour. I'm hooked as their customer, where replacement cartridges are need.
Ivo Hesmondhalgh
Ivo Hesmondhalgh
Speedy delivery, very helpful staff. I needed to return the attachment devices and they were very helpful and refunded me within days
scott cornwell
scott cornwell
Placed my order online but they still rang me to make sure I had ordered the correct items and to make sure I hadn't made a mistake when ordering. Fantastic service highly recommended. Thanks

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