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reverse osmosis

  • Cross Flow Filtration References

    Posted on May 15, 2015 by Sterlitech Corporation

    Sterlitech's cross flow testing cells, the CF042 and the Sepa CF cell, will soon be coming with their own guides to cross flow filtration.  Below is an excerpt from the guide, showcasing studies that illustrate the versatility of Sterlitech's cross flow filtration equipment and are helpful in developing your own experiments:

    The following studies utilized the Sterlitech crossflow cells in their method and are listed here to illustrate the potential applications for crossflow filtration.  These studies are good references for understanding the operation of the Sterlitech’s crossflow cells.

    Application Study Citation
    Reverse Osmosis (Desalination) 


    Sachit, Dawood Eisa. "Analysis of reverse osmosis membrane performance during desalination of simulated brackish surface waters." Journal of Membrane Science. 453. (2014): 136-154. 

    Forward Osmosis and Low Pressure Reverse Osmosis Yangali-Quintanilla, Victor, Zhenyu Li, et al. "Indirect desalination of Red Sea water with forward osmosis and low pressure reverse osmosis for water reuse."Desalination. 280. (2011): 160-166. 

    Ultrafiltration (Food Processing) 


    Post, Antonie, Hanna Sampels, et al. "A comparison of micellar casein and β-casein as sources of basic peptides through tryptic hydrolysis and their enrichment using two-stage ultrafiltration."International Journal of Dairy Technology. 65.4 (2012): 482-489. 

    Ultrafiltration and Nanofiltration (Protein Production) Ranamukhaarachi, Sahan, Lena Meissner, et al. "Production of antioxidant soy protein hydrolysates by sequential ultrafiltration and nanofiltration."Journal of Membrane Science. 429. (2013): 81-87.
    Membrane Development 


    Qadir, Ahmad. Development of new membranes for desalination pre-treatment. MA thesis. University of Illinois at Urbana-Champaign, 2011. Web. <>.


    This post was posted in cross-flow filtration, reverse osmosis, ultrafiltration, Nanofiltration, Membrane/Process Development

  • New Sepa CF Cell Animations

    Posted on February 9, 2015 by Sterlitech Corporation

    We have two new animations that show the inner workings and assembly of our Sepa CF and Sepa CF-FO membrane testing cells.

    The Sepa CF Cell is a lab-scale cross flow filtration unit that provides fast and accurate performance data with minimal amounts of membrane, product, expense or time.  This cell is capable of performing reverse osmosis, nanofiltration, ultrafiltration, and microfiltration.

    The Sepa CF-FO Cell is a variant designed for forward osmosis and pressure-retarded osmosis.

    Both of these cells are available on our Membrane/Process Development page along with all of the components necessary for operation.


    This post was posted in cross-flow filtration, Flat sheet membrane, reverse osmosis, ultrafiltration, Nanofiltration, Forward Osmosis, Membrane/Process Development

  • Sterlitech Customizable Membrane Test Systems

    Posted on July 31, 2014 by Sterlitech Corporation

    Sterlitech Corporation is now offering fully customizable membrane and process development systems which provide users with complete experimental control over the system’s flow parameters to simulate the dynamics of larger membrane systems.  Sterlitech first began building custom-made crossflow systems in 2011 and has since improved and expanded their capabilities to cover a wide range of applications in reverse osmosis, nanofiltration, ultrafiltration and microfiltration.

    These units can be individually tailored to meet the specific testing needs for off-the-shelf or custom membrane designs. Customizable factors include: membrane size, the number of cells in operation (up to 6), and whether the cells are run in sequence or in parallel.  Some of the new features built into the new testing units include a NEMA-standard waterproof touchscreen HMI panel and new back pressure regulators for better testing performance. This previously unattainable degree of flexibility is responsible for greatly improving operational efficiency.

    According to Sterlitech President Mark Spatz, “The biggest difference between an off-the-shelf test system and one built to match a customer’s flow specifications is how much time is saved between membrane tests.  This advantage is further compounded by the system’s ability to evaluate up to six membrane samples simultaneously.”

    Custom systems have already been created to assist in applications such as materials research and batch production of microbiological supplies.  Organizations with several different interests can quickly adjust the parameters to meet an assortment of testing needs. Each system ships with its own specially made instruction manual for easy reference.

    To explore the options that can be added to one of our customizable crossflow testing systems, click here.

    To view examples of crossflow testing systems that have been built for past customers, click here.


    This post was posted in cross-flow filtration, reverse osmosis, ultrafiltration, Nanofiltration, Membrane/Process Development

  • Sterlitech Simplifies SDI Testing with New SimpleSDI Kits

    Posted on June 6, 2014 by Sterlitech Corporation

    Sterlitech Corporation is adding new product options to its line of silt density index (SDI) testing devices. Sterlitech is offering these all-in-one units in response to the industry’s demand for a convenient and durable on-site tool for measuring the fouling capacity of the feed water used in reverse osmosis systems.

    Silt density index testing quantifies the amount of particulate contamination in a water source and is used to estimate the rate at which membrane fouling will occur, particularly in applications employing reverse osmosis membranes. The SDI of a feed source is measured by running a stream of feed water through a 0.45 micron filter at a constant pressure and calculating the rate at which the flow slows down (ASTM Test Method 4189-07).

    “Accurate and reliable SDI testing is key to maintaining good efficiency in membrane purification facilities and to help keep operating costs down, especially when dealing with sources like seawater which have a highly variable SDI,” notes Mark Spatz, founder and President of Sterlitech. “This can be an extremely valuable measurement when performed regularly.”

    Unlike previous automatic SDI kits, the SimpleSDI kit is uniquely suited for testing in the field due to its lightweight structure and rechargeable battery, which allows up to 13 hours of use between charges. Accurate and repeatable SDI measurements are automatically calculated by means of the integrated microprocessor at 5, 10, or 15 minute increments. Replacement filter membranes, booster pumps, and a manual version of the kit are also available through Sterlitech.

    Sterlitech Corporation provides superior laboratory products, specializing in flat sheet filter membranes and bench scale testing equipment for a variety of industries, including the occupational health and safety, petrochemical, fossil fuels and biotech industries. For precision and accuracy, Sterlitech’s membrane disc filters, filter holders, silt density index test kits, and syringe and capsule filters consistently relied upon to assure exceptional results.

    This post was posted in water treatment, reverse osmosis, Company News, Membrane/Process Development

  • New Toray Membranes Replace Obsolete Products

    Posted on May 14, 2014 by Sterlitech Corporation

    Toray is discontinuing the production of some of their reverse osmosis (RO) membranes. These membranes are being replaced in Sterlitech's line-up by the new 70HA, 70AC, 72U, and 82V membranes will be overtaking some of Toray's newly obsolescent membranes.  The table below lists the specifications of the new and obsolete membranes for easy comparison.  To browse our complete selection of RO membranes or to place an order with us, click here.



    Manufacturer Polymer Molecular Weight Cut-off (MWCO) Rej-Size 25C pH Range Typical

    (Obsolete 5/5/14)

    Toray Polyamide 0 MWCO 99.7 2-11 27/225

    (Obsolete 5/5/14)

    Toray Polyamide 0 MWCO 99.5 2-11 27/110

    (Obsolete 5/5/14)

    Toray Polyamide 0 MWCO 99.8 2-11 16/800

    (Obsolete 5/5/14)

    Toray Polyamide 0 MWCO 99.7 2-11 22/800





    Toray Polyamide 0 MWCO 99.0 2-11 23.3/73





    Toray Polyamide 0 MWCO 99.8 2-11 30.7/225





    Toray Polyamide 0 MWCO 99.4 2-11 29.5/109





    Toray Polyamide 0 MWCO 99.7 2-11 27/798


    This post was posted in bench scale, cross-flow filtration, Flat sheet membrane, reverse osmosis

  • UTC-80E Membranes from Toray Replaced by New UTC-82E Membranes

    Posted on April 11, 2014 by Sterlitech Corporation

    Toray is discontinuing the production of its UTC-80E reverse osmosis membranes. These membranes are being replaced in Sterlitech's line-up by the new UTC-82E membranes, which share the specifications of the UTC-80E.  We've listed their specifications below to aid comparison with other flat sheet membranes:

    Designation Polymer Molecular Weight Cut-off (MWCO) Rej-Size pH Range @ 25 °C Typical
    80E/82E Polyamide 0 MWCO 99.8 2-11 16/800


    *GFD = Gallons per square foot of membrane per day

    The following products are no longer being offered:

    • YM80ESP18
    • YM80ESP195
    • YM80ESP42
    • YM80ESP475

    You can click here to browse the complete list of reverse osmosis membranes that Sterlitech carries.

    This post was posted in bench scale, Flat sheet membrane, reverse osmosis, Company News

  • New simpleSDI Kits Offer Portable and Reliable Performance

    Posted on January 31, 2014 by Sterlitech Corporation

    The existence of suspended solids and colloidal materials in feed water pose one of the biggest problems in reverse osmosis systems. To help combat this issue, Sterlitech is adding new simpleSDI kits to supplement its existing line of automatic and manual silt density index testing kits from GE. The new kits are available in automatic and manual testing versions and utilize 47 mm diameter, 0.45 micron MCE membranes to measure the degree of potential fouling in an RO system.

    To view Sterlitech's entire line of SDI kits as well as supplementary information about SDI testing, click here.

    This post was posted in bench scale, water treatment, reverse osmosis, Forward Osmosis

  • TriSep Introduces New Membrane Concepts

    Posted on December 19, 2013 by Sterlitech Corporation

    The field of membrane technology is constantly changing and growing with new technologies to tackle new problems and introduce new capabilities.  TriSep Corporation is one the companies that is leading the way with its innovations, which they discuss in the December issue of International Filtration News Magazine.

    In TriSep's article, they introduce three new technologies:

    • A line of high-temperature elements that are capable of continuous operation and periodic sanitation.
    • TurboClean® sanitary hard shell elements, which provides higher flow velocity and efficiency than traditional sanitary elements.
    • The iSepTM ultrafiltration membrane, the first UF membrane that is specifically designed to the handle high-fouling water and wastewater feeds.

    The full article can be found in PDF form here.

    This post was posted in bench scale, cross-flow filtration, waste and wastewater treatment, TriSep, Flat sheet membrane, reverse osmosis, ultrafiltration

  • New Sepa CF II Assembly Tutorial Video

    Posted on July 23, 2013 by Sterlitech Corporation

    Today, we have a new video that shows you how to assemble a Sepa CF II cell and get it ready to perform reverse osmosis, nanofiltration, ultrafiltration or microfiltration at pressures up 1000 psig (69 bar).

    To learn more about the Sepa CF II, you can visit our Sepa CF II page here.

    This post was posted in bench scale, cross-flow filtration, Flat sheet membrane, reverse osmosis, ultrafiltration, Nanofiltration

  • CF042 Crossflow Cell In Action

    Posted on June 13, 2013 by Sterlitech Corporation

    If you've ever wanted to see a bit of reverse osmosis in action, here it is. In this video, we use CF042 Acrylic Cell to separate blue dye from water. This demonstration is run at 200 psi and uses a Toray 70UB reverse osmosis membrane to achieve separation.

    Also making a cameo appearance in this video is the HP4750 Stirred Cell, which is being used to hold up the tubing, but is not actually part of the separation process this time.


    To learn more about the products featured in the video, just visit our website:


    This post was posted in bench scale, applications, reverse osmosis

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