Franklin FWME2540RO-ULP Ultra Low Pressure RO Membrane

Ultra Low Pressure 2540 RO Membrane for Drinking Water Systems

When 400 GPD from a 2521 is not enough, the Franklin Water FWME2540RO-ULP reverse osmosis membrane nearly doubles output to 750 GPD in the same 2.5-inch diameter. This ultra-low-pressure 2540 membrane rejects 99.2% of dissolved salts across 27 ft² of active area. Tested at 150 psi with 1,500 mg/L NaCl and rated for feed water up to 2,000 mg/L TDS. NSF/ANSI 61 certified. Cleanflow is an authorized Franklin Water Treatment distributor shipping across Canada and the USA.

Quick Specs

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

• Element Size: 2.5" x 40" (standard 2540 format)

• Active Membrane Area: 27 ft² (2.5 m²)

• Permeate Flow Rate: 750 GPD (2.8 m³/d)

• Stabilized Salt Rejection: 99.2%

• Standard Test Pressure: 150 psi (1.03 MPa)

• Maximum Feed TDS: 2,000 mg/L

• Certification: NSF/ANSI 61

Key Features and Benefits

• 750 GPD from 27 ft² of active area, nearly double the output of a 2521 element in the same 2.5-inch diameter, the ULP 2540 commercial RO membrane specifies when a compact 2521 element can no longer keep pace with daily demand.

• Operates at 150 psi test pressure on feed water up to 2,000 mg/L TDS, an ultra low pressure 2540 membrane that keeps pump energy and electricity costs below what standard-pressure elements require.

• 99.2% stabilized salt rejection across municipal, surface, and groundwater sources, a low salinity RO membrane for commercial systems treating clean feed water below 2,000 mg/L TDS.

• NSF/ANSI 61 certified for drinking water contact. Installed in labs as a laboratory RO membrane for pure water preparation and in commercial facilities as a water vending RO membrane for higher-output self-serve stations.

• This 2540 TFC membrane element fits standard 2.5-inch pressure vessels at 40 inches long, sharing the same 2.5-inch diameter as the 2521 but requiring a 40-inch housing instead of 21. Compatible with other industry-standard reverse osmosis membranes.

• Cleaning pH range of 1 to 13 and maximum feed flow of 1.0 m³/h (4.4 gpm) for routine CIP on low-fouling municipal and groundwater sources.

FWME2540RO-ULP Specifications

Applications

• Commercial drinking water systems for offices, hotels, and multi-tenant buildings

• Laboratory pure water preparation and analytical instrument feed

• Water vending machines and high-throughput self-serve refill stations

• Boiler feed water and cooling tower makeup from clean sources

• Food and beverage process water production

• Surface water and groundwater treatment up to 2,000 mg/L TDS

• Pre-treatment stage for high-purity water and deionization systems

Industries

• Commercial water treatment

• Laboratories and research facilities

• Hospitality and property management

• Food and beverage service

• Light industrial process water

Buy the Franklin Water FWME2540RO-ULP Online from Cleanflow

When your 2521 element cannot keep up with daily demand, the FWME2540RO-ULP is the 2.5 x 40 reverse osmosis membrane that doubles your throughput without a housing diameter change. At 750 GPD with 99.2% rejection and NSF/ANSI 61 certification at just 150 psi, it keeps operating costs low while scaling output up. 

Cleanflow Utility Supply Company is an authorized Franklin Water Treatment distributor. The FWME2540RO-ULP, 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

How much more output does the 2540 give compared to the 2521?

The Franklin Water 2540 membrane produces 750 GPD from 27 ft² of active area, a 750 GPD RO membrane next to the 2521's 400 GPD from 14 ft². That is nearly double the output because the 40-inch length provides almost twice the membrane surface. Both fit 2.5-inch pressure vessels, but the 2540 RO membrane requires a longer housing.

Should I choose the 2540 or step up to a 4040 membrane?

The Franklin Water 2540 ULP produces 750 GPD at 150 psi in a 2.5-inch vessel. A 4040 element produces 2,500+ GPD but requires a 4-inch pressure vessel, larger pump, and more plumbing. Stay with the 2540 if your system already runs 2.5-inch housings and 750 GPD meets your demand. Move to a 4040 if you need more than 750 GPD per element or plan to scale beyond what 2.5-inch vessels can deliver.

Is the FWME2540RO-ULP suitable for office drinking water systems?

Yes. With NSF/ANSI 61 certification and 750 GPD output, this commercial drinking water RO membrane handles daily demand for mid-size offices, co-working spaces, and commercial buildings where a 2521 runs short. The 99.2% rejection rate removes dissolved solids from municipal tap water, producing clean drinking water at ultra low pressure with lower electricity costs than standard-pressure membranes.

Can I use the FWME2540RO-ULP for laboratory pure water preparation?

Yes. The Franklin Water FWME2540 produces RO-grade permeate suitable as feed water for deionization columns, ultrapure water polishing systems, and analytical instruments. At 750 GPD, it supports labs that consume more purified water per day than a 2521 can provide. Feed water must have SDI below 5 and free chlorine below 0.1 mg/L.

What pre-treatment does the FWME2540RO-ULP need?

Feed water must have less than 0.1 mg/L free chlorine and an SDI below 5. Install a carbon pre-filter for chlorine removal and a sediment filter for particulates. Cleanflow stocks compatible reverse osmosis filters for both stages. For groundwater with elevated hardness, add a softener or antiscalant dosing (a chemical that prevents mineral buildup) to protect the membrane. Because this membrane treats clean, low-TDS sources, scaling risk is lower than on brackish water, but pre-treatment is still required.