Lewabrane® RO S400 HR elements are spiral-wound, composite polyamide membrane elements designed for the desalination of seawater. The S400 HR membrane is characterized by an extremely durable, highly cross-linked polymeric separating layer suitable for high salinity, high-pressure applications. The Lewabrane® RO S400 HR membrane element is recommended for single-pass applications where stable salt rejection performance during the expected operating lifetime is an important consideration.
Element is tested under the following conditions: applied pressure 55.2 bar (800 psi), NaCl concentration 32,000 mg/l (or when tested on a mixed solution of 32,000 mg/l NaCl and 5 mg/l Boron), operating temperature 25 °C (77 °F), pH 8 and recovery rate 8 %.
Treat RO Elements with care; do not drop the element.
Each RO Element is wet tested, preserved in a 1% weight sodium bisulfite solution, and vacuum packed in oxygen barrier bags.
During storage, avoid freezing and direct sunlight. The temperature should be below 35 °C (95 °F).
Keep the RO Elements wet, and use a compatible preservative for storage duration longer than 7 days.
During the inital start up, discharge the first permeate to drain for 30 min.
Permeate back pressure should not exceed feed pressure at any time.
The RO Elements shall be maintained in a clean condition, unfouled by particulate matter or precipitates or biological growth.
Consider cleaning, if the pressure drop increases by 20% or water permeability decreases by 10%.
Use only chemicals which are compatible with the membrane.