High Rejection membranes

Membranes intended for applications requiring a high level of solute rejection, subject to review and approval.

Membrane array for high-quality water treatment

Quick Summary

The High Rejection series is intended for applications that require particularly high product water quality. Selection follows feed water quality, the water quality target and operating conditions, and is confirmed only after Nimbus reviews the site data.

Suitable application

Reviewed for processes requiring stringent product quality.

Selection conditions

Fit is determined by feed water composition, target quality and operating conditions.

The Complete BW Series for Brackish Water Applications

The BW Series is the complete Nimbus engineering solution category for brackish water applications, covering standard High Rejection models, low pressure models for reduced energy consumption and fouling resistant models. All BW models are intended for brackish water applications requiring high treated-water quality.

Final model selection depends on feed water characteristics, process requirements and operating conditions.

High Rejection Standard (NIM-BW)

NIM-BW-8040-HF

Brackish water membrane for applications requiring high treated-water quality.

8040 Format

Nominal permeate flow: 13,000 GPD (49.2 m³/d)
Nominal salt rejection: 99.55%
Active Membrane Area: 440 ft² (40.9 m²)
Max Operating Pressure: 600 psi (41 bar)

Nominal flow and rejection at the model’s test conditions; not a commitment to field performance.

Full Specs

Active Membrane Area

Active Membrane Area: 440 ft² (40.9 m²)

Operating Limits

Max Operating Pressure: 600 psi (41 bar)
Max Operating Temperature: 45°C (113°F)
Continuous Operating pH: 2.0–11.0
CIP pH Range: 1.0–12.0
Maximum Feed Water Silt Density Index: SDI15 < 5.0
Free Chlorine Tolerance: < 0.1 ppm
Max Pressure Drop per Element: 15 psi (1.0 bar)

Dimensions

Length: 40.0 in (1,016 mm)
Outer Diameter: 7.9 in (201 mm)
Central Tube Diameter: 1.125 in (28.6 mm)

Standard Test Conditions

Test Pressure: 225 psi
Salt Concentration: 2000 ppm NaCl
Test Temperature: 25°C
Recovery: 15%
Test pH: 7.5-8.0

Values are measured at the stated test conditions and are not a commitment to field performance. Engineering review is required for every application.

Request a Quote

NIM-BW-8040

Active Membrane Area

Active Membrane Area: 400 ft² (37.2 m²)

Operating Limits

Max Operating Pressure: 600 psi (41 bar)
Max Operating Temperature: 45°C (113°F)
Continuous Operating pH: 2.0–11.0
CIP pH Range: 1.0–12.0
Maximum Feed Water Silt Density Index: SDI15 < 5.0
Free Chlorine Tolerance: < 0.1 ppm
Max Pressure Drop per Element: 15 psi (1.0 bar)

Dimensions

Length: 40.0 in (1,016 mm)
Outer Diameter: 7.9 in (201 mm)
Central Tube Diameter: 1.125 in (28.6 mm)

Standard Test Conditions

Test Pressure: 225 psi
Salt Concentration: 2000 ppm NaCl
Test Temperature: 25°C
Recovery: 15%
Test pH: 7.5-8.0

Values are measured at the stated test conditions and are not a commitment to field performance. Engineering review is required for every application.

Request a Quote

NIM-BW-8040-E

Brackish water membrane for applications requiring high treated-water quality.

8040 Format

Nominal permeate flow: 10,500 GPD (39.7 m³/d)
Nominal salt rejection: 99.55%
Active Membrane Area: 400 ft² (37.2 m²)
Max Operating Pressure: 600 psi (41 bar)

Nominal flow and rejection at the model’s test conditions; not a commitment to field performance.

Full Specs

Active Membrane Area

Active Membrane Area: 400 ft² (37.2 m²)

Operating Limits

Max Operating Pressure: 600 psi (41 bar)
Max Operating Temperature: 45°C (113°F)
Continuous Operating pH: 2.0–11.0
CIP pH Range: 1.0–12.0
Maximum Feed Water Silt Density Index: SDI15 < 5.0
Free Chlorine Tolerance: < 0.1 ppm
Max Pressure Drop per Element: 15 psi (1.0 bar)

Dimensions

Length: 40.0 in (1,016 mm)
Outer Diameter: 7.9 in (201 mm)
Central Tube Diameter: 1.125 in (28.6 mm)

Standard Test Conditions

Test Pressure: 225 psi
Salt Concentration: 2000 ppm NaCl
Test Temperature: 25°C
Recovery: 15%
Test pH: 7.5-8.0

Values are measured at the stated test conditions and are not a commitment to field performance. Engineering review is required for every application.

Request a Quote

NIM-BW-4040-HF

Brackish water membrane for applications requiring high treated-water quality.

4040 Format

Nominal permeate flow: 2,900 GPD (11 m³/d)
Nominal salt rejection: 99.5%
Active Membrane Area: 85–90 ft² (7.9–8.4 m²)
Max Operating Pressure: 600 psi (41 bar)

Nominal flow and rejection at the model’s test conditions; not a commitment to field performance.

Full Specs

Active Membrane Area

Active Membrane Area: 85–90 ft² (7.9–8.4 m²)

Operating Limits

Max Operating Pressure: 600 psi (41 bar)
Max Operating Temperature: 45°C (113°F)
Continuous Operating pH: 2.0–11.0
CIP pH Range: 1.0–12.0
Maximum Feed Water Silt Density Index: SDI15 < 5.0
Free Chlorine Tolerance: < 0.1 ppm
Max Pressure Drop per Element: 15 psi (1.0 bar)

Dimensions

Length: 40.0 in (1,016 mm)
Outer Diameter: 3.9 in (99 mm)
Central Tube Diameter: 0.75 in (19.0 mm)

Standard Test Conditions

Test Pressure: 225 psi
Salt Concentration: 2000 ppm NaCl
Test Temperature: 25°C
Recovery: 15%
Test pH: 7.5-8.0

Values are measured at the stated test conditions and are not a commitment to field performance. Engineering review is required for every application.

Request a Quote

NIM-BW-4040

Brackish water membrane for applications requiring high treated-water quality.

4040 Format

Nominal permeate flow: 2,500 GPD (9.5 m³/d)
Nominal salt rejection: 99.6%
Active Membrane Area: 85–90 ft² (7.9–8.4 m²)
Max Operating Pressure: 600 psi (41 bar)

Nominal flow and rejection at the model’s test conditions; not a commitment to field performance.

Full Specs

Active Membrane Area

Active Membrane Area: 85–90 ft² (7.9–8.4 m²)

Operating Limits

Max Operating Pressure: 600 psi (41 bar)
Max Operating Temperature: 45°C (113°F)
Continuous Operating pH: 2.0–11.0
CIP pH Range: 1.0–12.0
Maximum Feed Water Silt Density Index: SDI15 < 5.0
Free Chlorine Tolerance: < 0.1 ppm
Max Pressure Drop per Element: 15 psi (1.0 bar)

Dimensions

Length: 40.0 in (1,016 mm)
Outer Diameter: 3.9 in (99 mm)
Central Tube Diameter: 0.75 in (19.0 mm)

Standard Test Conditions

Test Pressure: 225 psi
Salt Concentration: 2000 ppm NaCl
Test Temperature: 25°C
Recovery: 15%
Test pH: 7.5-8.0

Values are measured at the stated test conditions and are not a commitment to field performance. Engineering review is required for every application.

Request a Quote

NIM-BW-4040-E

Brackish water membrane for applications requiring high treated-water quality.

4040 Format

Nominal permeate flow: 2,400 GPD (9.1 m³/d)
Nominal salt rejection: 99.5%
Active Membrane Area: 85–90 ft² (7.9–8.4 m²)
Max Operating Pressure: 600 psi (41 bar)

Nominal flow and rejection at the model’s test conditions; not a commitment to field performance.

Full Specs

Active Membrane Area

Active Membrane Area: 85–90 ft² (7.9–8.4 m²)

Operating Limits

Max Operating Pressure: 600 psi (41 bar)
Max Operating Temperature: 45°C (113°F)
Continuous Operating pH: 2.0–11.0
CIP pH Range: 1.0–12.0
Maximum Feed Water Silt Density Index: SDI15 < 5.0
Free Chlorine Tolerance: < 0.1 ppm
Max Pressure Drop per Element: 15 psi (1.0 bar)

Dimensions

Length: 40.0 in (1,016 mm)
Outer Diameter: 3.9 in (99 mm)
Central Tube Diameter: 0.75 in (19.0 mm)

Standard Test Conditions

Test Pressure: 225 psi
Salt Concentration: 2000 ppm NaCl
Test Temperature: 25°C
Recovery: 15%
Test pH: 7.5-8.0

Values are measured at the stated test conditions and are not a commitment to field performance. Engineering review is required for every application.

Request a Quote

Low Energy / Low Pressure (NIM-BW-LE)

NIM-BW-LE-8040-HF

Low pressure brackish water membrane for applications where energy consumption is a design consideration.

8040 Format

Nominal permeate flow: 12,500 GPD (47.3 m³/d)
Nominal salt rejection: 99.5%
Active Membrane Area: 440 ft² (40.9 m²)
Max Operating Pressure: 600 psi (41 bar)

Nominal flow and rejection at the model’s test conditions; not a commitment to field performance.

Full Specs

Active Membrane Area

Active Membrane Area: 440 ft² (40.9 m²)

Operating Limits

Max Operating Pressure: 600 psi (41 bar)
Max Operating Temperature: 45°C (113°F)
Continuous Operating pH: 2.0–11.0
CIP pH Range: 1.0–12.0
Maximum Feed Water Silt Density Index: SDI15 < 5.0
Free Chlorine Tolerance: < 0.1 ppm
Max Pressure Drop per Element: 15 psi (1.0 bar)

Dimensions

Length: 40.0 in (1,016 mm)
Outer Diameter: 7.9 in (201 mm)
Central Tube Diameter: 1.125 in (28.6 mm)

Standard Test Conditions

Test Pressure: 150 psi
Salt Concentration: 1500 ppm NaCl
Test Temperature: 25°C
Recovery: 15%
Test pH: 7.5-8.0

Values are measured at the stated test conditions and are not a commitment to field performance. Engineering review is required for every application.

Request a Quote

NIM-BW-LE-8040-MR

Low pressure brackish water membrane for applications where energy consumption is a design consideration.

8040 Format

Nominal permeate flow: 10,500 GPD (39.7 m³/d)
Nominal salt rejection: 99.6%
Active Membrane Area: 400 ft² (37.2 m²)
Max Operating Pressure: 600 psi (41 bar)

Nominal flow and rejection at the model’s test conditions; not a commitment to field performance.

Full Specs

Active Membrane Area

Active Membrane Area: 400 ft² (37.2 m²)

Operating Limits

Max Operating Pressure: 600 psi (41 bar)
Max Operating Temperature: 45°C (113°F)
Continuous Operating pH: 2.0–11.0
CIP pH Range: 1.0–12.0
Maximum Feed Water Silt Density Index: SDI15 < 5.0
Free Chlorine Tolerance: < 0.1 ppm
Max Pressure Drop per Element: 15 psi (1.0 bar)

Dimensions

Length: 40.0 in (1,016 mm)
Outer Diameter: 7.9 in (201 mm)
Central Tube Diameter: 1.125 in (28.6 mm)

Standard Test Conditions

Test Pressure: 150 psi
Salt Concentration: 1500 ppm NaCl
Test Temperature: 25°C
Recovery: 15%
Test pH: 7.5-8.0

Values are measured at the stated test conditions and are not a commitment to field performance. Engineering review is required for every application.

Request a Quote

NIM-BW-LE-4040-HF

Low pressure brackish water membrane for applications where energy consumption is a design consideration.

4040 Format

Nominal permeate flow: 2,700 GPD (10.2 m³/d)
Nominal salt rejection: 99.5%
Active Membrane Area: 85–90 ft² (7.9–8.4 m²)
Max Operating Pressure: 600 psi (41 bar)

Nominal flow and rejection at the model’s test conditions; not a commitment to field performance.

Full Specs

Active Membrane Area

Active Membrane Area: 85–90 ft² (7.9–8.4 m²)

Operating Limits

Max Operating Pressure: 600 psi (41 bar)
Max Operating Temperature: 45°C (113°F)
Continuous Operating pH: 2.0–11.0
CIP pH Range: 1.0–12.0
Maximum Feed Water Silt Density Index: SDI15 < 5.0
Free Chlorine Tolerance: < 0.1 ppm
Max Pressure Drop per Element: 15 psi (1.0 bar)

Dimensions

Length: 40.0 in (1,016 mm)
Outer Diameter: 3.9 in (99 mm)
Central Tube Diameter: 0.75 in (19.0 mm)

Standard Test Conditions

Test Pressure: 150 psi
Salt Concentration: 1500 ppm NaCl
Test Temperature: 25°C
Recovery: 15%
Test pH: 7.5-8.0

Values are measured at the stated test conditions and are not a commitment to field performance. Engineering review is required for every application.

Request a Quote

NIM-BW-LE-4040-MR

Low pressure brackish water membrane for applications where energy consumption is a design consideration.

4040 Format

Nominal permeate flow: 2,400 GPD (9.1 m³/d)
Nominal salt rejection: 99.6%
Active Membrane Area: 85–90 ft² (7.9–8.4 m²)
Max Operating Pressure: 600 psi (41 bar)

Nominal flow and rejection at the model’s test conditions; not a commitment to field performance.

Full Specs

Active Membrane Area

Active Membrane Area: 85–90 ft² (7.9–8.4 m²)

Operating Limits

Max Operating Pressure: 600 psi (41 bar)
Max Operating Temperature: 45°C (113°F)
Continuous Operating pH: 2.0–11.0
CIP pH Range: 1.0–12.0
Maximum Feed Water Silt Density Index: SDI15 < 5.0
Free Chlorine Tolerance: < 0.1 ppm
Max Pressure Drop per Element: 15 psi (1.0 bar)

Dimensions

Length: 40.0 in (1,016 mm)
Outer Diameter: 3.9 in (99 mm)
Central Tube Diameter: 0.75 in (19.0 mm)

Standard Test Conditions

Test Pressure: 150 psi
Salt Concentration: 1500 ppm NaCl
Test Temperature: 25°C
Recovery: 15%
Test pH: 7.5-8.0

Values are measured at the stated test conditions and are not a commitment to field performance. Engineering review is required for every application.

Request a Quote

Fouling Resistant (NIM-BW-FR)

NIM-BW-8040XLFR

Active Membrane Area

Active Membrane Area: 400 ft² (37.2 m²)

Operating Limits

Max Operating Pressure: 600 psi (41 bar)
Max Operating Temperature: 45°C (113°F)
Continuous Operating pH: 2.0–11.0
CIP pH Range: 1.0–12.0
Maximum Feed Water Silt Density Index: SDI15 < 5.0
Free Chlorine Tolerance: < 0.1 ppm
Max Pressure Drop per Element: 15 psi (1.0 bar)

Dimensions

Length: 40.0 in (1,016 mm)
Outer Diameter: 7.9 in (201 mm)
Central Tube Diameter: 1.125 in (28.6 mm)

Standard Test Conditions

Test Pressure: 225 psi
Salt Concentration: 2000 ppm NaCl
Test Temperature: 25°C
Recovery: 15%
Test pH: 7.5-8.0

Values are measured at the stated test conditions and are not a commitment to field performance. Engineering review is required for every application.

Request a Quote

NIM-BW-FR-8040-LD

Brackish water membrane for applications where feed water conditions may increase fouling potential.

8040 Format

Nominal permeate flow: 10,500 GPD (39.7 m³/d)
Nominal salt rejection: 99.75%
Active Membrane Area: 400 ft² (37.2 m²)
Max Operating Pressure: 600 psi (41 bar)

Nominal flow and rejection at the model’s test conditions; not a commitment to field performance.

Full Specs

Active Membrane Area

Active Membrane Area: 400 ft² (37.2 m²)

Operating Limits

Max Operating Pressure: 600 psi (41 bar)
Max Operating Temperature: 45°C (113°F)
Continuous Operating pH: 2.0–11.0
CIP pH Range: 1.0–12.0
Maximum Feed Water Silt Density Index: SDI15 < 5.0
Free Chlorine Tolerance: < 0.1 ppm
Max Pressure Drop per Element: 15 psi (1.0 bar)

Dimensions

Length: 40.0 in (1,016 mm)
Outer Diameter: 7.9 in (201 mm)
Central Tube Diameter: 1.125 in (28.6 mm)

Standard Test Conditions

Test Pressure: 225 psi
Salt Concentration: 2000 ppm NaCl
Test Temperature: 25°C
Recovery: 15%
Test pH: 7.5-8.0

Values are measured at the stated test conditions and are not a commitment to field performance. Engineering review is required for every application.

Request a Quote

NIM-BW-FR-4040

Brackish water membrane for applications where feed water conditions may increase fouling potential.

4040 Format

Nominal permeate flow: 2,300 GPD (8.7 m³/d)
Nominal salt rejection: 99.6%
Active Membrane Area: 85–90 ft² (7.9–8.4 m²)
Max Operating Pressure: 600 psi (41 bar)

Nominal flow and rejection at the model’s test conditions; not a commitment to field performance.

Full Specs

Active Membrane Area

Active Membrane Area: 85–90 ft² (7.9–8.4 m²)

Operating Limits

Max Operating Pressure: 600 psi (41 bar)
Max Operating Temperature: 45°C (113°F)
Continuous Operating pH: 2.0–11.0
CIP pH Range: 1.0–12.0
Maximum Feed Water Silt Density Index: SDI15 < 5.0
Free Chlorine Tolerance: < 0.1 ppm
Max Pressure Drop per Element: 15 psi (1.0 bar)

Dimensions

Length: 40.0 in (1,016 mm)
Outer Diameter: 3.9 in (99 mm)
Central Tube Diameter: 0.75 in (19.0 mm)

Standard Test Conditions

Test Pressure: 225 psi
Salt Concentration: 2000 ppm NaCl
Test Temperature: 25°C
Recovery: 15%
Test pH: 7.5-8.0

Values are measured at the stated test conditions and are not a commitment to field performance. Engineering review is required for every application.

Request a Quote

Brackish Water Membrane Solutions

Brackish water membrane solutions are widely used across industrial, infrastructure and process water applications.

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Check a Nimbus Alternative

Selecting a water-treatment solution is an engineering and operational process. It begins with the water source, composition, variation over time, required flow, target quality, operating hours, site constraints and maintenance approach. A technology name alone is not sufficient to establish suitability.

Website information is general and is not a quotation, binding specification, fit approval or engineering approval. Scope, equipment, performance and conditions will be determined only after data review and an approved Nimbus proposal.