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DOW RO Membrane Model -  BW30-4040

DOW RO Membrane Model - BW30-4040


Specifications :-

  • Highly durable with good filtration capacity for long life.

  • Due to thick feed space, the chances of fouling are very low.

  • Shell made up of fiberglass hard shells to withstand high pressure drops.

  • Higher rejection provides quality water output.

  • Checked through a series of inspections and tested before getting shipped.


*Inclusive of All Taxes
Free Delivery
10 days Replacement
1 Year Warranty


Reverse Osmosis Process is the most efficient and economical process of filtration used in industrial applications these days. During this process water molecules are forced through semi-permeable membranes to remove impurities and contaminants. 

Technical Specifications DOW RO Membrane Model -  BW30-4040

DOW FilmTec Product: BW30-4040

Size (Approximate):  4" Dia. x 40"L

Flow Rate: 2,400 gpd (9.1 m³/d)

Applied Pressure: 225 psig (15.5 bar)

Stabilized Salt Rejection: 99.5%

Active Surface Area: 78 Sq. Ft.

Single Element Recovery: 15%

Exterior: Hard Shell Fiberglass

Feed Spacer: 34 mil

Membrane Type: Polyamide Thin-Film Composite


Maximum Operating Temperature: 113°F (45°C)

Maximum Operating Pressure: 600 psig (41 bar)

Maximum Pressure Drop: 15 psig (1 bar)

Maximum Feed Flow Rate: 16 gpm (3.6m³/h)

pH Range, Continuous Operation*: 2-11

pH Range, Short-Term Cleaning**: 1-13

Maximum Feed Silt Density Index: SDI 5

Free Chlorine Tolerance***: <0.1ppm

*Maximum temperature for continuous operation above pH 10 is 95°F

**Refer to cleaning guidelines.

***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.

Warranty 1 Year against Manufacturing Defects Only

Customer Rating
3 in stock

Membranes are the principal component of the Industrial RO system. Membranes are made of spiral wound sheets of semi-permeable material designed to let pure water flow through, while keeping back all other impurities. Within industrial applications, the standard length of each membrane has been set to forty inches and in larger applications can go upto 80 inches. With a Pore size of about 0.0001 micron, this excludes most dissolved contaminants while allowing water molecules to pass through. 

Application Areas DOW RO Membrane Model -  BW30-4040-

These membranes are widely used in water filtration technology of Reverse Osmosis. With the use of pressure and force ( generally from a pumping system), the natural process of osmosis is reversed as feed water being is pushed through the semi-permeable membranes thus overcoming the natural process of osmosis , this ensures that the impurities are left behind and the filtered water flow out.



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