Get the Best Water Filtration with SpiroPure 4040 RO Membrane

Q: What is the flow rate of a 4040 membrane water filter?

Rated flow depends on the model. The specifications table lists SP-XL4040, SP-UL4040, SP-BW4040 and SP-FR4040 at 2,400 gallons per day (GPD), and SP-SW4040 at 1,700 GPD, under their respective test conditions. Actual output depends on feedwater conditions and system operation. Compare each model’s test pressure and feedwater specifications before selecting a replacement.

Q: What is the difference between a 4040 RO membrane and a 4x40 membrane?

"4040" and "4x40" refer to the same nominal element dimensions: 4 inches in diameter by 40 inches in length. They identify size, not identical membrane performance or compatibility. Before ordering, confirm your existing membrane model, feedwater requirements, operating conditions and pressure-vessel specifications.

Q: How long does a 4040 membrane last in water filtration systems?

With proper pretreatment and maintenance, SpiroPure 4040 membranes typically last two to five years. Lifespan depends on feed water quality, operating pressure, and prefilter upkeep. Chlorine exposure, scaling, and sediment fouling are common causes of premature failure or when membranes sit unused without proper maintenance and storage between use.

Q: Can the 4x40 RO membrane be used for industrial water filtration?

Yes. The 4040 is the standard industrial RO membrane size for single or multi-element FRP or stainless steel pressure vessels in commercial and industrial settings. SpiroPure offers 4040 membranes in brackish water, ultra-low pressure, extremely low pressure, fouling-resistant, and seawater desalination types, covering municipal tap water, high-TDS groundwater, and salt water.

Q: How do I maintain my 4x40 membrane water filter?

Follow the membrane and system manufacturers’ maintenance instructions. Monitor operating pressure, permeate flow and water quality, and service pretreatment components as directed. For extended shutdowns, follow the model-specific flushing and preservation instructions, including any required preservative, concentration and storage conditions. Contact the team at All Filters if you need the applicable instructions.

SpiroPure's NSF-certified industrial reverse osmosis (RO) membranes are effective for commercial RO systems and other heavy-duty RO applications. 4040 membrane elements, such as the brackish water BW4040 RO membrane, ultra-low pressure ULP-4040 membrane, XLE-4040 / XLP 4040 extremely low-pressure membrane, FLR-4040 / FR-4040 fouling-resistant membrane, and more, provide high-performance TDS removal. Seawater desalination membranes provide high rejection of sodium for seawater treatment and other high-salinity water treatments.

	Membrane Type	Model	Rejection Rate	Average Permeate ±15%	Feedwater NaCl	Fresh Water Recovery Rate	Concentration of Salt Solution (Feedwater NaCl)	Feed Spacer	Maximum Recommended NaCl	Maximum Operating Pressure
4040 RO Membranes	Extremely Low Pressure	SP-XL4040	98.5%	2,400 GPD @ 100 psi	500 ppm	15%	500 ppm	28 mil	< 2,000 ppm	600 psi
	Ultra Low Pressure	SP-UL4040	99.4%	2,400 GPD @ 150 psi	1,500 ppm	15%	1,500 ppm	28 mil	< 5,000 ppm	600 psi
	Brackish Water	SP-BW4040	99.5%	2,400 GPD @ 225 psi	2,000 ppm	15%	2,000 ppm	28 mil	< 10,000 ppm	600 psi
	Fouling Resistant	SP-FR4040	99.5%	2,400 GPD @ 225 psi	2,000 ppm	15%	2,000 ppm	34 mil	< 10,000 ppm	600 psi
	Seawater Desalination	SP-SW4040	99.7%	1,700 GPD @ 800 psi	32,000 ppm	8%	32,000 ppm	28 mil	< 40,000 ppm	1,200 psi

Membrane Type	SpiroPure	Dupont / Filmtec	Toray	Hydranautics / Nitto	GE / SUEZ	Axeon	LG Chem	Hydron
Extremely Low Pressure	SP-XL4040	XLE-4040	TMH10A	ESPA4-4040		XE1–4040	LG BW 4040 UES	HLE-4040
Ultra Low Pressure	SP-UL4040	LE-4040	TMG10D	ESPA2-4040		LE1-4040	LG BW 4040 ES
Brackish Water	SP-BW4040	TW30-4040	TML10D	CPA2-4040	AG4040FM	RE1-4040	LG BW 4040 R	BW-4040
Fouling Resistant	SP-FR4040		TML10D	LFC3-LD-4040
Seawater Desalination	SP-SW4040	SW30-4040	TM810V	SWC5-LD-4040		SE1-4040	LG SW 4040 R

Fouling-resistant membranes have a wider spacer to reduce clogging, making them ideal for wastewater and other heavy-duty applications. When you need 4x40 membranes that deliver high RO performance, our brackish water, ultra-low pressure, and extreme-low pressure elements are effective options. Each option meets progressively lower pressure requirements to help reduce energy consumption.

Find Compatible RO Membranes

Finding the right replacement RO membrane is straightforward with All Filters’ cross-reference chart, located just below the specifications chart. First, check the Membrane Type column to find the category that matches the membrane you need to replace. Next, compare your current membrane model and brand, such as XLE-4040 Dupont / Filmtec, TMH10A Toray, or ESPA4-4040 Hydranautics / Nitto in the first three rows and columns.

Specifications for a Perfect Fit

Once you’ve found your model and brand, you’ll be able to determine which SpiroPure 4x40 industrial RO membrane is a compatible replacement. SpiroPure 4040 RO membranes aim to match OEM quality, offering reliable performance with significant cost savings. If you refer to the specifications chart, you can compare aspects like rejection rate, feedwater tolerance, and fresh water recovery rate.

Support and Benefits at All Filters

For help choosing compatible membranes, our customer support team is available seven days a week. Here are some key benefits you’ll enjoy when shopping at All Filters:

Wide selection: A comprehensive range of filters to cover different models, types, and usage requirements.
Comparing pricing: Check the current price, specifications and compatibility of the SpiroPure model you need before comparing it with other replacement options.
High quality: Our filters aim to deliver the same high standards and reliability as original manufacturer options.

Buy 4040 RO Membranes Online

Get high-quality membranes for your filtration system at affordable prices from All Filters. Use our cross-reference chart to find the right filter or contact our friendly customer service team. Enjoy fast and reliable delivery, with most orders shipped the same day. Order 4x40 RO membranes online today, and enjoy free shipping on orders over $99.

FAQs on 4040 RO Membrane

What is the flow rate of a 4040 membrane water filter?

Rated flow depends on the model. The specifications table lists SP-XL4040, SP-UL4040, SP-BW4040 and SP-FR4040 at 2,400 gallons per day (GPD), and SP-SW4040 at 1,700 GPD, under their respective test conditions. Actual output depends on feedwater conditions and system operation. Compare each model’s test pressure and feedwater specifications before selecting a replacement.

What is the difference between a 4040 RO membrane and a 4x40 membrane?

“4040” and “4x40” refer to the same nominal element dimensions: 4 inches in diameter by 40 inches in length. They identify size, not identical membrane performance or compatibility. Before ordering, confirm your existing membrane model, feedwater requirements, operating conditions and pressure-vessel specifications.

How long does a 4040 membrane last in water filtration systems?

With proper pretreatment and maintenance, SpiroPure 4040 membranes typically last two to five years. Lifespan depends on feed water quality, operating pressure, and prefilter upkeep. Chlorine exposure, scaling, and sediment fouling are common causes of premature failure or when membranes sit unused without proper maintenance and storage between use.

Can the 4x40 RO membrane be used for industrial water filtration?

Yes. The 4040 is the standard industrial RO membrane size for single or multi-element FRP or stainless steel pressure vessels in commercial and industrial settings. SpiroPure offers 4040 membranes in brackish water, ultra-low pressure, extremely low pressure, fouling-resistant, and seawater desalination types, covering municipal tap water, high-TDS groundwater, and salt water.

How do I maintain my 4x40 membrane water filter?

Follow the membrane and system manufacturers’ maintenance instructions. Monitor operating pressure, permeate flow and water quality, and service pretreatment components as directed. For extended shutdowns, follow the model-specific flushing and preservation instructions, including any required preservative, concentration and storage conditions. Contact the team at All Filters if you need the applicable instructions.

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Get the Best Water Filtration with SpiroPure 4040 RO Membrane

Membrane Type

Model

Rejection Rate

Average Permeate ±15%

Feedwater NaCl

Fresh Water Recovery Rate

Concentration of Salt Solution (Feedwater NaCl)

Feed Spacer

Maximum Recommended NaCl

Maximum Operating Pressure

4040 RO Membranes

Extremely Low Pressure

SP-XL4040

98.5%

2,400 GPD @ 100 psi

500 ppm

15%

500 ppm

28 mil

< 2,000 ppm

600 psi

Ultra Low Pressure

SP-UL4040

99.4%

2,400 GPD @ 150 psi

1,500 ppm

15%

1,500 ppm

28 mil

< 5,000 ppm

600 psi

Brackish Water

SP-BW4040

99.5%

2,400 GPD @ 225 psi

2,000 ppm

15%

2,000 ppm

28 mil

< 10,000 ppm

600 psi

Fouling Resistant

SP-FR4040

99.5%

2,400 GPD @ 225 psi

2,000 ppm

15%

2,000 ppm

34 mil

< 10,000 ppm

600 psi

Seawater Desalination

SP-SW4040

99.7%

1,700 GPD @ 800 psi

32,000 ppm

8%

32,000 ppm

28 mil

< 40,000 ppm

1,200 psi

Membrane Type

SpiroPure

Dupont / Filmtec

Toray

Hydranautics / Nitto

GE / SUEZ

Axeon

LG Chem

Hydron

Extremely Low Pressure

SP-XL4040

XLE-4040

TMH10A

ESPA4-4040

XE1–4040

LG BW 4040 UES

HLE-4040

Ultra Low Pressure