The Walchin Brackish Water Series is specifically designed for water with alkalinity greater than hardness, high concentrations of neutral salts, and a pH value greater than 7. Our brackish water reverse osmosis membrane offers high-performance filtration, effectively removing:
✅ Over 90% of soluble salts
✅ More than 99% of colloidal microorganisms and organic matter
This membrane system offers several benefits:
Ideal for a variety of brackish water treatment applications, our membranes provide a cost-effective and reliable solution for both small and large-scale operations.
🔹 Customization Available! We offer OEM & bulk supply solutions tailored to your specific requirements. Contact us via the Chat icon for more details
Performance parameters
Model |
Membrane Type |
Membrane area/ft² |
Flow GPD(m³/d) |
Stable desalination rate/% |
BW-4040-HF |
Polyamide composite membrane |
90 |
2400(9.1) |
99.3 |
Water production floating range:±15%
Model/Size(mm) |
A |
B |
C |
D |
BW-4040-HF |
40.0(1016) |
1.05(26.7) |
0.75(19) |
3.9(99) |
Test conditions
Test solution concentration(NaCl) |
Water temperature(℃) |
pH |
Operating pressure psi(MPa) |
Recovery rate(%) |
2000ppm |
25 |
7.5-8 |
225(1.55) |
15 |
Operating Limits
Maximum working pressure |
600psi(4.14MPa) |
Maximum water inlet temperature |
45℃ |
Maximum water inlet flow |
16GPM(3.6m³/h) |
Maximum water inlet SDI15 |
5 |
Maximum residual chlorine concentration(mg/L) |
0.1 |
Inlet water pH range during continuous operation |
2-11 |
pH range of Inlet water during chemical cleaning |
1-13 |
Maximum allowable pressure drop of a single membrane element |
15psi(0.1MPa) |