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Dow Filmtec LE-4040 Reverse Osmosis (RO) Membrane

2,500 GPD industrial / commercial low energy replacement reverse osmosis (RO) membrane element

Filmtec brackish water reverse osmosis membrane elements provide consistent, outstanding system performance in light industrial applications. Filmtec LE-4040 delivers highest performance at lowest pressure resulting in less energy usage and lower costs. Elements with a hard shell exterior are recommended for systems with multiple-element housings containing three or more membranes, as they are designed to withstand higher pressure drops.

LE-4040 replaces BW30LE-4040.

Specifications:
Membrane Type:Polyamide Thin-Film Composite (TFC)
Maximum Operating Temperature:113F (45C)
Maximum Operating Pressure:600 psi (41 bar)
Maximum Pressure Drop:15 psi (1.0 bar)
Maximum Feed Flow Rate:16 gpm (3.6 m3/hr)
pH Range, Continuous Operation:2-11***
pH Range, Short-Term Cleaning:1-13* (30min)
Maximum Feed Silt Density Index:5 SDI
Free Chlorine Tolerance:<0.1 ppm**
Permeate Flow Rate:2,500 GPD (9.5 m3/day)*
Stabilized Salt Rejection:99.0%
Filmtec LE-4040 Reverse Osmosis (RO) Membrane

*Permeate flow and salt rejection based on the following test conditions: 2,000 ppm NaCl, applied pressure of 150 psig (10.3 bar) , 77F (25C) and 15% recovery. Permeate flows for individual elements may vary +/-20%.

**Under certain conditions, the presence of free chlorine and other oxidizing agents will cause premature membrane failure. Since oxidation damage is not covered under warranty, Dow recommends removing residual free chlorine by pretreatment prior to membrane exposure. Most RO systems have carbon pre-filters for this purpose.

***Maximum temperature for continuous operation above pH 10 is 95F (35C).

Dimensions:

   A: 40.0" (1,016mm)
   B: 1.05" (26.7mm)
   C: 0.75" (19mm)
   D: 3.9" (99mm)
Filmtec LE-4040 Size Chart
Model Diameter Inches Length Inches Active Surface
Area ft2 (m2)
Test Pressure Permeate Flow
Capacity
GPD (m3/day)
Price
(w/ Free Shipping)
Filmtec LE-4040
Our Stock #703275173
Dow Part #275173
4.0 40 78 (7.2) 150 psi 2,500 (9.5) Sorry, this membrane has been discontinued. Recommended Replacement: Filmtec LC LE-4040

Notice: The use of this product in and of itself does not necessarily guarantee the removal of cysts and pathogens from water. Effective cyst and pathogen reduction is dependent on the complete system design and on the operation and maintenance of the system.

Customer Questions & Answers



Question:What is KDF?
Answer(s):

Kinetic Degradation Fluxion (KDF) is a high-purity copper-zinc formulation that uses a basic chemical process known as redox (oxidation/reduction) to remove chlorine, lead, mercury, iron, and hydrogen sulfide from water supplies.
By HomePlus Water on Aug 01, 2023


Question:How does KDF Work?
Answer(s):

In short, the KDF redox process works by exchanging electrons with contaminants. This "give and take" of electrons converts many contaminants into harmless components. During this reaction, electrons are transferred between molecules, and new elements are created. Some harmful contaminants are changed into harmless components. Others are electrochemically bound to the KDF media.
By HomePlus Water on Aug 01, 2023


Question:What contaminants does KDF remove?
Answer(s):

KDF process media works to reduce or remove chlorine, iron, hydrogen sulfide, lead, mercury, magnesium, and chromium. It may also inhibit the growth of bacteria, algae, and fungi. Redox media removes up to 98% of water-soluble cations (positively-charged ions) of lead, mercury, copper, nickel, chromium, and other dissolved metals. More than 98% of chlorine is generally removed.
By HomePlus Water on Aug 01, 2023


Question:Why is KDF used in shower water filters?
Answer(s):

KDF is frequently found in home showerhead filters because of its effectiveness at higher operating temperatures and flow rates.
By HomePlus Water on Aug 01, 2023


Question:How much arsenic is safe in water
Answer(s):

The USEPA and the World Health Organization (WHO) have set a maximum contaminant level (MCL) for arsenic in drinking water at 0.010 mg/L or 10 parts per billion. Although this is the level that the USEPA enforces, they state that the level of arsenic in drinking water below which there is no known or expected risk to health is zero.
By HomePlus Water on Aug 02, 2023


Question:How can arsenic get into a drinking water supply?
Answer(s):

Arsenic is naturally found in mineral deposits in rocks and soils, and can contaminate water that it comes in contact with. Arsenic can also enter the drinking water supply through manmade sources including the discharge of industrial wastes, the burning of fossil fuels, metal production & mining, the incorrect application of pesticides and feed additives, and waste burning.
By HomePlus Water on Aug 02, 2023


Question:Does reverse osmosis remove arsenic from water?
Answer(s):

Yes, reverse osmosis can be used to remove pentavalent arsenic (also known as Arsenic 5, Arsenic V, or Arsenate). Reverse osmosis will not remove trivalent arsenic. If you have trivalent arsenic (also known as Arsenic 3, Arsenic III, or Arsenite), you should pre-chlorinate your water to transform the trivalent arsenic into pentavalent arsenic before using reverse osmosis for treatment.
By HomePlus Water on Aug 02, 2023


Question:Does boiling water remove arsenic?
Answer(s):

No, boiling water is not an effective treatment for arsenic in water. As the water is heated some may evaporate, actually increasing the arsenic concentration in the water.
By HomePlus Water on Aug 02, 2023


Question:Is it safe to use for outdoor use such as water the lawn or garden?
Answer(s):

Using water that is contaminated with coliform bacteria on lawns, or ornamental gardens is safe. If you are referring to a garden where food is being grown for human consumption I would recommend treating the water before using it. While coliform bacteria on your produce isn't typically a big deal, it is considered an indicator for other potential contaminants such as e-coli which would be a more serious issue. Many e-coli outbreaks are due to contaminated produce.
By HomePlus Water on Dec 11, 2023