Hydranautics ESPA4 MAX Membrane

Product Description

When it comes to energy-saving polyamide membranes, you can't beat the ESPA4 MAX. It offers the same rejection characteristics as ESPA but with even higher flow rates. The growing family of ESPA RO membranes continue to meet the ever-increasing demands of the water treatment industry. Industrial users worldwide have made ESPA their first choice for high productivity and salt rejection.

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ESPA4 MAX Specifications:

Permeate Flow: 13,200 gpd (50m³/d)
Salt Rejection: 99.2% (99.0% minimum)
Configuration: Spiral Wound
Membrane Polymer: Composite Polyamide
Membrane Active Area: 440ft² (40.8m²)

The stated performance is initial (data taken after 30 minutes of operation), based on the following conditions:

500 PPM NaCl solution
100 psi (0.7 MPa) Applied Pressure
77ºF (25ºC) Operating Temperature
15% Permeate Recovery
6.5 - 7.0 pH Range

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Standard Operating Limits:

Maximum Applied Pressure: 600 psig (4.16 MPa)
Maximum Chlorine Concentration: < 0.1 PPM
Maximum Operating Temperature: 113°F (45°C)
pH Range, Continuous (Cleaning): 2-10 (1-12)
Maximum Feedwater Turbidity: 1.0 NTU
Maximum Feedwater SDI (15 mins): 5.0
Maximum Feed Flow: 75 GPM (17.0m³/h)
Minimum Ratio of Concentrate to Permeate Flow for any Element: 5:1
Maximum Pressure Drop for Each Element: 10 psi

The limitations shown here are for general use. For specific projects, operating at more conservative values may ensure the best performance and longest life of the membrane. See Hydranautics Technical Bulletins for more detail on operation limits, cleaning pH, and cleaning temperatures.

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