Franklin FWME4040RO-XLP Extra Low Pressure RO Membrane

Energy Efficient 4040 RO Membrane for Municipal Water, Bottled Water Production, and Second Pass RO at Extra Low Pressure

If your feed water is municipal, surface, or groundwater below 2,000 mg/L TDS, a brackish water membrane wastes energy pushing against resistance you do not have. The Franklin Water FWME4040RO-XLP extra-low-pressure RO membrane operates at just 100 psi, roughly half the pressure of a BW element, producing 9.8 m³/d from 90 ft² of active area with 99.2% salt rejection. 

Quick Specs

• Membrane Type: Thin-Film Composite (TFC), Extra Low Pressure

• Element Size: 4" x 40" (standard 4040 format)

• Active Membrane Area: 90 ft² (8.4 m²)

• Permeate Flow Rate: 9.8 m³/d (GPD figure to be confirmed by Franklin Water)*

• Stabilized Salt Rejection: 99.2%

• Standard Test Pressure: 100 psi (0.69 MPa)

• Maximum Feed TDS: 2,000 mg/L

• Certification: NSF/ANSI 61

Key Features and Benefits

• Operates at 100 psi test pressure, roughly half what a brackish water membrane requires, making this a low-energy 4040 RO membrane that cuts pump sizing and electricity costs across every cubic metre of permeate produced.

• 99.2% stabilized salt rejection on feed water up to 2,000 mg/L TDS, the right low-TDS RO membrane for clean municipal and groundwater sources that do not need brackish-grade pressure.

• 90 ft² of active area, the largest in the Franklin Water 4040 lineup, produces 9.8 m³/d at low energy cost, making it the most energy-efficient commercial 4040 membrane in the range.

• NSF/ANSI 61 certified for drinking water contact, covering municipal water RO membrane applications from purified water production to bottled water RO lines.

• This XLP 4040 RO membrane fits standard 4040 pressure vessels and drops into the same housings as the BW model and other industry-standard reverse osmosis membranes, so switching from BW to XLP requires no housing changes.

• Cleaning pH range of 1 to 13 with 3.6 m³/h (15.9 gpm) maximum feed flow for routine CIP cycles on low-fouling municipal and groundwater sources.

FWME4040RO-XLP Specifications

Applications

• Municipal tap water treatment for commercial and light industrial facilities

• Purified water production and bottled water manufacturing

• Second pass RO for high-purity permeate in pharmaceutical and electronics applications

• Surface water and low-TDS groundwater treatment

• Boiler feed water and cooling tower makeup from clean sources

• Food and beverage process water production

• Pre-treatment for deionization and ultrapure water systems

Industries

• Bottled water and beverage production

• Municipal water treatment

• Pharmaceutical and biotechnology

• Electronics and semiconductor manufacturing

• Food processing

• Commercial facility management

Buy the Franklin Water FWME4040RO-XLP Online from Cleanflow

When your source water is clean and your priority is keeping operating costs low, the FWME4040RO-XLP is the extra low pressure 4040 reverse osmosis membrane to specify. At 9.8 m³/d with 99.2% rejection at just 100 psi, it delivers output comparable to a BW element at a fraction of the energy cost. 

Cleanflow Utility Supply Company is an authorized Franklin Water Treatment distributor. The FWME4040RO-XLP, compatible reverse osmosis system accessories, and replacement parts ship across Canada and the USA. Returns accepted within 30 days at returns.cleanflow.net.

Frequently Asked Questions

Should I choose the XLP or BW version of the Franklin Water 4040 membrane?

Choose the Franklin Water 4040 XLP membrane when your feed water TDS is below 2,000 mg/L and energy costs matter. The XLP operates at 100 psi vs 225 psi for the BW, which means a smaller pump and lower electricity bills. Output is rated at 9.8 m³/d. Choose the BW when your source water exceeds 2,000 mg/L TDS or when you need the higher 99.6% rejection rate for brackish well water or industrial sources.

Can I use this membrane on well water?

Only if your well water TDS stays below 2,000 mg/L. As a low pressure commercial RO membrane in the 4 x 40 format, it is rated for clean groundwater, not brackish sources. Get a water analysis first. If TDS exceeds 2,000 mg/L or the water has high hardness, iron, or manganese, spec the brackish water FWME4040RO-BW instead.

What makes the FWME4040RO-XLP good for bottled water production?

Bottled water operations treat clean municipal or spring water that typically tests below 500 mg/L TDS. A brackish water membrane would work, but it wastes energy on water that is clean. This Franklin Water XLP membrane runs at 100 psi on that feed water, keeping electricity costs low across high-volume production lines. NSF/ANSI 61 certification confirms it meets health effects requirements for drinking water contact.

What is a second-pass RO system, and why use this membrane for it?

A second-pass RO system takes the permeate from a first-pass membrane and filters it again for higher purity. First-pass permeate typically has very low TDS, under 50 to 100 mg/L, so the second-pass membrane needs minimal pressure to do its job. The FWME4040RO-XLP operates at just 100 psi with 9.8 m³/d output, making it an efficient second-pass RO membrane in the 4040 format for pharmaceutical, electronics, and ultrapure water applications.

What pre-treatment does the FWME4040RO-XLP need?

Feed water must have less than 0.1 mg/L free chlorine and an SDI below 5. Install carbon pre-filtration for chlorine removal and sediment filtration for particulates. Cleanflow stocks compatible reverse osmosis filters for both stages. Because this membrane runs on clean, low-TDS sources, fouling risk is lower than with brackish water, but pre-treatment is still required to protect this extra-low-pressure 4040 reverse osmosis membrane from chlorine damage.