- Catalog item
- BK-C-SW-400
- Catalog output
- 7500 GPD (28.4 m³/d)
Catalog capacities are selection references. Final output, energy use and water quality depend on the confirmed feed water, operating conditions and supplied configuration.
Configuration & selection
Review seasonal seawater salinity and temperature, boron requirements and the pressure-vessel rating. A membrane salt-rejection figure alone does not demonstrate drinking-water compliance or approve an element as a direct replacement.
Membrane specifications & test conditions
| Membrane model | SW-400 |
|---|---|
| Active membrane area | 400 ft² (37.2 m²) |
| Feed spacer | 32 mil |
| Permeate flow at test conditions | 7500 GPD (28.4 m³/d) |
| Stabilized salt rejection | 99.8% |
| Minimum salt rejection | 99.6% |
| Test pressure | 800 psi (5.52 MPa) |
| Test solution | 32000 mg/L NaCl + 5 mg/L B (H₃BO₃) |
| Test temperature | 25 °C |
| Test pH | 7.5–8.0 |
| Test recovery | 8% |
These are single-element catalog test values, not a guaranteed system output. Compare flow and rejection only with their stated pressure, feed solution, temperature and recovery. Confirm dimensions, connections and the system projection before replacement.
Specify the operating conditions
- Feed-water source, salinity, temperature and analysis
- Required permeate flow, quality and operating hours
- Existing model, dimensions, connectors and pressure vessel
- Element quantity, array layout and delivery destination
A matching model format or similar test flow does not establish interchangeability. Confirm mechanical fit and system performance before replacement.
Applications
From selection to installation
Request a proposal with the equipment list, process arrangement, utility requirements, delivery scope and maintenance access. Agree on commissioning responsibilities, consumables and spare parts before placing an order.
Other products in this series
BW-4040 — brackish water RO membrane
BK-BW-4040 · 2500 GPD (9.5 m³/d)
For brackish-water treatment and industrial water preparation. Compare the membrane area, test flow and salt rejection with your feed-water analysis and installed vessel arrangement.
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BW-8040 — brackish water RO membrane
BK-BW-8040 · 10500 GPD (39.7 m³/d)
For brackish-water treatment and industrial water preparation. Compare the membrane area, test flow and salt rejection with your feed-water analysis and installed vessel arrangement.
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BW-4040FR — fouling-resistant RO membrane
BK-BW-4040FR · 2000 GPD (7.6 m³/d)
A fouling-resistant membrane option for reuse-water and challenging feed-water enquiries. Its catalog uses a 34 mil spacer; selection still requires a pretreatment and cleaning review.
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ULP-8040MR-2 — ultra-low-pressure RO membrane
BK-ULP-8040MR-2 · 10500 GPD (39.7 m³/d)
An ultra-low-pressure RO element for lower-salinity water preparation. Compare its stated test pressure and feed concentration with the BW range before selecting a membrane for an existing pump and vessel layout.
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SW-4040 — seawater RO membrane
BK-C-SW-4040 · 1600 GPD (6.1 m³/d)
A seawater RO element with catalog performance stated under seawater-strength salt and boron test conditions. Evaluate the membrane together with the high-pressure system, intake pretreatment and product-water target.
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