- Catalog item
- BK-BW-4040
- Catalog output
- 2500 GPD (9.5 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
Specify the feed-water salinity, hardness, silica and temperature together with the required permeate quality. For a replacement, confirm the exact element dimensions, product-water tube and connectors before agreeing on compatibility.
Membrane specifications & test conditions
| Membrane model | BW-4040 |
|---|---|
| Active membrane area | 85 ft² (7.9 m²) |
| Feed spacer | 28 mil |
| Permeate flow at test conditions | 2500 GPD (9.5 m³/d) |
| Stabilized salt rejection | 99.60% |
| Minimum salt rejection | 99.50% |
| Test pressure | 225 psi (1.55 MPa) |
| Test solution | 2000 mg/L NaCl |
| Test temperature | 25 °C |
| Test pH | 7.5–8.0 |
| Test recovery | 15% |
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-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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SW-400 — seawater RO membrane
BK-C-SW-400 · 7500 GPD (28.4 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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