Reverse Osmosis Membrane Specifications
Features
Reverse osmosis membrane gives excellent performance for a wide variety of applications including low-pressure tapwater purification, single-pass seawater desalination, chemical processing, and waste treatment. This membrane exhibits high rejection at low pressures with very stable long-term operation.
| Solute |
MW |
Rejection (%) |
| Sodium fluoride NaF1 |
42 |
99 |
| Sodium chloride NaCl |
58 |
99 |
| Silica SiO2 (50 ppm) |
60 |
60 |
| Sodium bicarbonate NaHCO3 |
84 |
99 |
| Sodium nitrate NaNO3 |
85 |
97 |
| Magnesium chloride MgCl2 |
95 |
99 |
| Calcium chloride CaCl2 |
111 |
99 |
| Magnesium sulfate MgSO4 |
120 |
>99 |
| Nickel sulfate NiSO4 |
155 |
>99 |
| Copper sulfate CuSO4 |
160 |
>90 |
| Formaldehyde |
30 |
35 |
| Methanol |
32 |
25 |
| Ethanol |
46 |
70 |
| Isopropanol |
60 |
90 |
| Urea |
60 |
97 |
| Lactic acid (pH 2) |
90 |
94 |
| Lactic acid (pH 5) |
90 |
99 |
| Lactic acid (pH 5) |
90 |
99 |
| Glucose |
180 |
98 |
| Sucrose |
342 |
99 |
| Chlorinated pesticides (traces) |
− |
>99 |
- Solute rejection (approximate) 2,000 ppm solute, 225 psi (1.6 MPa), 77°F (25°C), pH 7 (unless otherwise noted).
- Fluoride rejection is strongly pH dependent (about 75% at pH 5, 50% at pH 4, 30% at pH 3.5 and 0% below pH 3).
- FT30 membrane is available in a wide variety of spiral-wound configurations.
Operating Limits
| Membrane type | Thin-film composite polyamide |
| Maximum operating pressure | 1,000 psi (6.9 MPa) |
| Maximum operating temperature | 113°F (45°C) |
| Free chlorine tolerance | < 0.1 ppm |
| pH range, continuous operation | 2 - 11 |
| pH range, short-term cleaning (30 min.) | 1 - 13 |
