FFM LP Series Low-Pressure RO Membrane
FFM’s low-pressure RO membrane delivers more than 99% desalination efficiency at just 0.8-1.2 Mpa operating pressure—approximately two-thirds that of conventional membranes.
Ideal for municipal tap water, groundwater, and surface water with low-to-medium salinity, it significantly reduces equipment and operational costs.
This series of membrane is widely deployed in water purification facilities and across food and beverage, dairy, electronics, pharmaceutical, and other light industrial sectors.
| Model | Effective Membrane Area ft² (m²) |
Test Pressure psi (bar) |
Permeate Flow gpd (l/h) |
Stable Salt Rejection % |
|---|---|---|---|---|
| FFM2521LP | 14 (1.3) | 150 | 300 (1.13) | 99 |
| FFM2540LP | 30 (2.8) | 150 | 750 (2.8) | 99 |
| FFM4021LP | 36 (3.4) | 150 | 950 (3.6) | 99 |
| FFM4040LP | 85 (7.9) | 150 | 2100 (7.9) | 99.6 |
| FFM8040LP | 375 (34.9) | 150 | 10000 (37.8) | 99.6 |
| FFM8040LP-400 | 400 (37.2) | 150 | 10500 (39.7) | 99.6 |
| FFM8040LP-440 | 440 (41) | 150 | 12500 (47.3) | 99.6 |
1. Test conditions: 500 mg/L (NaCl) aqueous solution; water temperature 25℃; recovery rate 50%;
2. The permeate flow rate of a single membrane element may vary within +/- 15%.
3. Membrane element performance parameters may change after product updates.
Operating and design parameters (operating limits):
| Maximum Operating Temperature | 113°F (45°C) |
| Maximum Operating Pressure | 600 psi (4.1 MPa) |
| Maximum Pressure Drop Per Element | 15 psi (0.1 MPa) |
| Maximum Pressure Drop Per Vessel | 50 psi (0.35 MPa) |
| pH Range, Continuous Operation | 2–11 |
| pH Range, Short Term Cleaning (30 min) | 1–13 |
| Maximum Feed Water SDI (15 mins) | 5 |
| Maximum Chlorine Concentration | < 0.1 mg/L |
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FFM2540LP FFM2521LP FFM4021LP FFM4040LP FFM8040LP-440 FFM8040LP-375 FFM8040LP-400