What is the same on both the LC LE-4040 and LC LE PRO-4040?

Form factor: standard 4040 size (40″ length, 0.75″ permeate tube), tape-wrapped construction — fully interchangeable in standard 4040 pressure vessels with no system modifications. Rated performance basis: Both are low-energy elements designed for high-quality permeate at low pressure in harsh water conditions, in the same 4040 footprint. Membrane chemistry: polyamide thin-film composite (TFC). Operating limits: 600 psig maximum operating pressure, 113 °F (45 °C) maximum temperature, feed SDI ≤ 5, free chlorine

Filmtec LC LE PRO-4040 Low Energy Brackish Water Reverse Osmosis Element

Q: What is the difference between the LC LE-4040 and the LC LE PRO-4040?

Current vs. discontinued: the LC LE PRO-4040 is the element DuPont manufactures today; the LC LE-4040 is no longer produced. Remaining “LC LE-4040” stock on the market is new-old-stock that may have been warehoused for years. Performance: The PRO element is rated 2,600 GPD with 99.5% stabilized salt rejection (99.0% minimum) at 150 psig on a 2,000 ppm NaCl feed, and carries an industry-leading 94 ft² of active area in the 4040 format — more membrane in the same footprint means lower flux per square foot and gentler, more fouling-resistant operation. The original LC LE-4040 was rated at a lower 125 psig test pressure, so data-sheet flow figures are not directly comparable. Newer manufacturing platform: the PRO series is built on DuPont's current precision, automated fabrication line, delivering tighter element-to-element consistency than the legacy process. Dry-shipped element: the LC LE PRO-4040 ships as a dry element — long shelf life and quick performance stabilization at start-up.

Q: Can I replace my LC LE-4040 with a LC LE PRO-4040 without changing my system?

Yes. The LC LE PRO-4040 is a drop-in replacement for the LC LE-4040 — same dimensions, connections, and vessel fit. No re-plumbing, housing change, or pump adjustment is required for a standard installation.

Description

FilmTec™ LC LE PRO-4040 is DuPont’s low-energy brackish water reverse osmosis element for commercial and industrial systems producing up to ~10 GPM of permeate. It is the direct replacement for the discontinued DOW FilmTec LC LE-4040, delivering higher rejection (99.5% stabilized) and industry-leading 94 sq.ft. active area at low operating pressure — reducing pump energy and operating cost.

Typical applications: commercial & industrial water demineralization, municipal drinking water production, and water reuse. Fits standard nominal 4" × 40" pressure vessels.

TECHNICAL SPECIFICATIONS: Filmtec LC LE PRO-4040 Low Energy Brackish Water RO Element

SKU / Model	LCLE-PRO-4040
Product Type	Brackish Water Reverse Osmosis Membrane Element
Replaces	DOW FilmTec LC LE-4040 (discontinued)
Permeate Flow	2,600 GPD (9.85 m³/d) at test conditions
Active Membrane Area	94 sq. ft.
Stabilized Salt Rejection	99.5% (99.0% minimum)
Test Conditions	125 psig, 2,000 ppm NaCl
Max Operating Pressure	600 psig (41 bar)
Max Operating Temperature	113°F (45°C)
pH Range	2–11 continuous; 1–13 short-term cleaning
Element Dimensions	3.9" dia. × 40" L (fits nominal 4" pressure vessels)
Membrane / Shell	Polyamide thin-film composite / hard-shell fiberglass
Manufacturer	DuPont Water Solutions (FilmTec™)
Shipping Weight	~12 lbs (boxed)
Shipping Dimensions	6" × 44" × 6" (boxed W × L × D)
HS Code (Tariff)	8421.21.0000 — water filtering/purifying apparatus
Warranty	1-Year materials & workmanship; 3-Year prorated performance warranty from DuPont (commercial elements, per DuPont conditions)

Question? Please contact us

Frequently Asked Questions: LC LE-4040 vs. LC LE PRO-4040

What happened to the FilmTec LC LE-4040?

DuPont discontinued the original FilmTec LC LE-4040 and replaced it with the FilmTec LC LE PRO-4040, its official direct successor. It drops into the same 4040 housings with no system modifications.

What is the difference between the LC LE-4040 and the LC LE PRO-4040?

Current vs. discontinued: the LC LE PRO-4040 is the element DuPont manufactures today; the LC LE-4040 is no longer produced. Remaining “LC LE-4040” stock on the market is new-old-stock that may have been warehoused for years.
Performance: The PRO element is rated 2,600 GPD with 99.5% stabilized salt rejection (99.0% minimum) at 150 psig on a 2,000 ppm NaCl feed, and carries an industry-leading 94 ft² of active area in the 4040 format — more membrane in the same footprint means lower flux per square foot and gentler, more fouling-resistant operation. The original LC LE-4040 was rated at a lower 125 psig test pressure, so data-sheet flow figures are not directly comparable.
Newer manufacturing platform: the PRO series is built on DuPont's current precision, automated fabrication line, delivering tighter element-to-element consistency than the legacy process.
Dry-shipped element: the LC LE PRO-4040 ships as a dry element — long shelf life and quick performance stabilization at start-up.

What is the same on both elements?

Form factor: standard 4040 size (40″ length, 0.75″ permeate tube), tape-wrapped construction — fully interchangeable in standard 4040 pressure vessels with no system modifications.
Rated performance basis: Both are low-energy elements designed for high-quality permeate at low pressure in harsh water conditions, in the same 4040 footprint.
Membrane chemistry: polyamide thin-film composite (TFC).
Operating limits: 600 psig maximum operating pressure, 113 °F (45 °C) maximum temperature, feed SDI ≤ 5, free chlorine < 0.1 ppm.

Can I replace my LC LE-4040 with a LC LE PRO-4040 without changing my system?

Yes. The LC LE PRO-4040 is a drop-in replacement for the LC LE-4040 — same dimensions, connections, and vessel fit. No re-plumbing, housing change, or pump adjustment is required for a standard installation.