Sterlitech Blog

Your source for new information on filtration equipment applications and processes.

  1. The Sterlitech Glass Filter funnel assembly gets an upsize!

    The Sterlitech Glass Filter funnel assembly gets an upsize!

    13mm, 25mm, 47mm, and 90mm – These were the available diameters of various glass filter funnels available suitable for use with membrane disc filters; until now.

    Sterlitech is proud to announce the launch of a new larger 150 mm diameter All-Glass Filter Assembly with a 10 liter receiver flask for processing significantly higher volumes in a single holder! Borosilicate glass filter funnels are ideal tools for use in laboratory and bench-scale filtration as they have very good chemical resistance against solvents, caustics, and most acids. When paired with the right membrane disc filter, they find a place in almost any microfiltration application area.

    The 150mm All-Glass assembly comes after a year of development work that originally centered on the filtering active compounds for cannabis applications in a process known as winterizing (cold filtering) extracts. The 90mm funnel assembly has been working hard in this area for that time, but more extraction facilities are coming on line and the need arose for a higher throughput processing design.

    The new assembly uses the same proven technology as the 90mm holders, but now has a 2 liter funnel on top, a funnel base with a PTFE-coated stainless steel membrane support screen, a GL14 port to connect to a vacuum line, and a 10 liter receiver coated with PVC to minimize risk of thermal and mechanical shock.

    Compatible with any thin-film or polymeric membrane disc filter of 150mm diameter, such as cellulose, PES, PTFE, and many more, the 150mm All-Glass assembly will be available for release in Early August 2017 for $2545.46.  Sterlitech will also offer this unit as part of a complete Botanical Extract Filter Kit that includes a vacuum pump, tubing, and 3 packs of filters for $3603.85. Contact a filtration specialist today at to learn more about this new tool for filtering liquids faster than ever!

  2. Introducing: PEEK5 Membrane Flat Sheets From Novamem

    Introducing: PEEK5 Membrane Flat Sheets From Novamem

    The chemically resistant and thermally stable polyether ether ketone (PEEK) membranes from Novamem Switzerland are now available with 5nm pore size rating. The membranes are available as 25mm disks, 47mm disks, and 10x10cm coupons. They are also available as CF016, CF042, and Sepa cuts.

    Material: PEEK
    New Pore Size: 5nm

    PEEK membrane applications:
    • Dialyze monomers & polymers in solvents
    • Degassing of harsh chemicals
    • Membrane pervaporation & membrane distillation
    • Battery separators & semiconductor applications
    • Nanofiltration & gas separation with user’s specific coating

    To learn more about the Novamem PEEK membranes, please review or feel free to contact us.

  3. Aquaporin Hollow Fiber FO Membrane Modules (AQPHFFO2)

    Aquaporin Hollow Fiber FO Membrane Modules (AQPHFFO2)

    Aquaporin hollow fiber membrane modules for forward osmosis studies are now available from Sterlitech. AQP HFFO2 is a cross flow membrane module containing Aquaporin Inside™ hollow fiber membranes. With an Aquaporin Inside™ coating on the interior surface of the hollow fibers (lumen side), the feed solution is circulated in the lumen and the draw solution is circulated in the shell.

    The Aquaporin Inside™ technology is based on the aquaporin protein, nature's own selective and extremely effective water channel. Aquaporin water channels have been developed through billions of years of evolution, and are now ready to revolutionize industrial water treatment.

    Forward osmosis (FO), also known as engineered osmosis, is a membrane separation process that takes advantage of the pressure gradient between two solutions of different concentrations to move the solvent from one side of the membrane to the other.

    As a result, FO requires much lower operating pressures than other membrane processes (such as reverse osmosis) and, consequently, has lower energy requirements.


    • Concentration of valuable components 

    • Pre-treatment of difficult wastewater before reverse osmosis (RO) treatment

    • Zero or Minimal Liquid Discharge applications


    • 2.3 m2 membrane active area

    • Aquaporin Inside™ coating on the lumen side of the fiber

    • Inner diameter: 195µm

    • Wall thickness: 35µm

    • Housing material: Polycarbonate

    • Module dimensions: 300mm long, 70mm in diameter

    To learn more about the AQPHFFO2 hollow fiber FO membrane modules, please review or feel free to contact us.  

  4. Kato-Katz  analysis technique for Soil-Transmitted Helminthiasis (STH)

    Kato-Katz  analysis technique for Soil-Transmitted Helminthiasis (STH)

    In last October’s newsletter, Sterlitech announced the availability of kits for performing the Kato-Katz  analysis technique for Soil-Transmitted Helminthiasis (STH) in field-based applications, signifying the first time that these kits were available from a source in the United States. Prior to this, the efforts of research groups and health organizations could be hampered by limited availability. Recognizing the global health need, Sterlitech developed the kits to ensure a consistent and reliable supply. We are pleased to announce that, in less than a year, Sterlitech has already supplied enough Kato-Katz Kits to perform 87,000 diagnostic tests.

    The Kato-Katz Kits are used to identify and enumerate parasitic eggs in feces samples from at-risk individual. The testing enables clinicians and field scientists to diagnose infection by the parasitic worms that cause intestinal schistosomiasis and STH.  According to the World Health Organization (WHO), schistosomiasis is endemic in 58 countries across Africa, Asia, and South America, putting over 700 million people at risk for infection. The WHO estimates in excess of 240 million persons are already infected and, of those, several million have severe morbidity from advanced disease resulting in over 200,000 deaths per year. STH is even more prevalent, with the WHO estimating that fully 24% of the world’s population, or 1.5 billion people, are infected in the tropical and subtropical regions of the Americas, Africa, and Asia. These diseases are particularly insidious because they predominantly affect the poor in underdeveloped areas lacking modern sanitation. 

    The WHO’s strategy for these diseases primarily relies on mass treatment of high risk populations with deworming medications. While it may not be practical, or economically prudent, to perform diagnostic testing on each treated individual, strategic diagnostic testing of sentinel groups using the Kato-Katz technique is critical for identifying high-risk populations and monitoring treatment effectiveness. Sterlitech is committed to supporting these efforts.

    Included in each Kato-Katz kit are the materials necessary for performing 500 tests. The entire kit is contained in a small portable box for easy use in field locations, enabling field technicians to diagnose infection in remote locations. Sterlitech also offers Schistosome Test Kits that are used to detect schistosome eggs in urine as part of the detection of urogenital schistosomiasis.

  5. Microfiltration: Rocker VF12 Kit Saves Time and Money

    Microfiltration: Rocker VF12 Kit Saves Time and Money

    Filtering organic solvents for applications such as HPLC buffer prep can be challenging in order to ensure chemical compatibility with filters (PVDF, Nylon, or PTFE), preserving longevity of an HPLC column, or containment of toxic fumes, but finding a suitable and comprehensive vacuum system is now easier than ever.

    Sterlitech is now offering a comprehensive benchtop vacuum system, the Rocker-VF12 Kit, targeted to the purification of organic or corrosive liquids such as mobile phase solvents for HPLC analysis. Each kit comes complete with a PTFE-coated Rocker 300C Pump, silicone vacuum tubing, and a 300 mL capacity glass filter funnel assembly connected directly to a GL45 waste bottle. The system has the flexibility for adapting to any capacity GL45 bottle, so transfer of filtrate is no longer required – a time saver! Kits are available in both 110V and 220V.

    *Until December 31st, 2017, purchase your kit at an additional 15% off using the discount code: TimeSaver

    Need an efficient and safe way to contain your HPLC waste? Get to know our EZWaste Solvent Waste System or contact Sterlitech to discuss your application. 

  6. Membrane biofouling mitigation through applying electric potential in the CF016 cell

    Membrane biofouling mitigation through applying electric potential in the CF016 cell

    Membrane filtration is an effective way to remove pollutants and microorganisms from water and wastewater. However, membrane fouling lowers efficiency over time when considering rejection values and water flux.  Fouling is typically biological or particulate; fouling rate is a function of the membrane pore size relative to the size of the foulants and also the interactions between the membrane and the foulants. Membrane surface charges and affinity for water directly affect membrane biofouling intensity. Applying electric charge to the membrane surface is one of the methods that has been recently trending for mitigating biofouling [1]. Use of an electroconductive nano-carbon-based membrane has also been reported for mitigating membrane fouling by integrating membrane filtration [2].

    In an effort to meet the demand for a cross flow cell that allows users to apply alternating voltage to a flat sheet membrane, Sterlitech recently developed an Electrode Modified Cross Flow Assembly.

    The CF016A Electrode Modified Crossflow Assembly consists of the following parts:

    1. Cell top

    2. Cell bottom

    3. Tightening screws

    4. O-rings

    5. Sintered metal support

    6. Titanium shim (0.083 inch thickness)

    7. Titanium electrods (1/16 inch diamter)

    Electrode Modified CF016A

    The CF016A Electrode Modified Crossflow Assembly is a laboratory-scale crossflow filtration unit that is designed to evaluate flat sheet membranes in a variety of applications. It simulates the flow dynamics of larger, commercially available membrane elements such as industrial spiral wound membrane elements.

    CF016A EM Specs

    Contact Sterlitech to learn more or request a quote.

    [1] Research Trends, Membrane Technology, 2013, Issue 5, p13.
    [2] Aquatic Biofouling Prevention by Electrically Charged Nanocomposite Polymer Thin Film Membranes, Environ. Sci. Technol., 2013, 47 (6), pp 2760–2768

  7. Get Your Samples Here!

    Get Your Samples Here!

    Did you know that Sterlitech offers 16 different material types of microporous membrane and media disk filters?  The available combinations of materials, pore, and disk sizes, equates to well over 1000 unique filters.  To many, that may sound like an overwhelming selection to choose from, whether you’re unsure where to start, have narrowed down your selection to one or a few material types, or have a clear range of pore sizes to stay within for optimal separation; in any case, we can help to further refine your selection.

    “That’s great!” you say and “I would like to test several different filter options, but I don’t want to buy standard packs of up to 100 disk filters, when I only need a few filters for my evaluation.”  Don’t worry; we still have you covered. 

    Sterlitech offers sample packs of our most popular membrane disk filters. Each sample pack is material specific, and come with 5 pairs of disk filters (10 total); you select the diameter and pore size for each pair.  The sample packs allow you to test a variety of filter options at minimal cost as needed to identify the most optimal filters for your application.  Once you have determined the best fit, it’s easy to purchase standard filter packs, which are more economical on a cost per filter basis.

    The sample packs offer disk filter diameters of 13mm, 25mm and 47mm.  These are the most common filter diameters that we offer and are applicable for most evaluations.  However, if you need a different size for your evaluation, don’t fret.  Please contact us and we will be glad to make arrangements for you to purchase sample filters in a size that is suitable for your needs.

    You might be thinking, “I appreciate the flexibility with sample sizes, but what if I want to evaluate a membrane material that is not offered in the sample packs? If you still need to evaluate a material that is not listed, please contact us and we will certainly do our best to accommodate your request.  In most cases, we can arrive at a sample filter solution that is mutually beneficial.

    Order your sample packs today and discover the filter that is just right for you.

  8. Polycarbonate Filters in Legionella Detection (Update)

    Polycarbonate Filters in Legionella Detection (Update)

    There’s no shortage of news stories on a tiny bacterium continuing to cause big trouble; Legionella. In a recent search of Google News, 1800 different stories from across the globe are revealed for June of this year when searched strictly against the term “Legionella.”  Illustrations of how serious a threat is this bacterium can be are seen across the variety of the news stories; from people becoming infected after using contaminated showers in gyms, hotels, hospitals, to babies born in birthing pools, basic residential water supplies, and even a simple backyard garden hose.  So, what is this nasty little microorganism, and why is it still causing trouble? To look closer, let’s revisit two newsletter stories Sterlitech originally published back in December 2010 and April 2011 respectively. No Water

    If you are unfamiliar with Legionella, it is a waterborne pathogen commonly found in aerosolized waters such as cooling towers, showers, and humidifiers, and it is best known as the cause of Legionnaire’s Disease as well as Pontiac Fever. Its name originated from an outbreak that occurred at the 1976 convention of the American Legion in Philadelphia.

    There are two areas in which membranes are used in regards to dealing with Legionella: Sample preparation and point-of-use filtration. For sample preparation, the CDC (Centers for Disease Control) recommends using a 0.2 micron, 47mm polycarbonate filter to extract Legionella bacterium from potable water. Non-potable water utilizes a direct plating procedure.

    Point of use filtration frequently involves a device that attaches to a faucet or showerhead to eliminate Legionella. Such devices have filters built into them, usually made of Nylon or PFT. A few years ago, the American Journal of Infection Control conducted a study of these devices and found them to be extremely effective at preventing the spread of waterborne pathogens. The CDC also has up-to-the-date guidelines on testing samples for Legionella, and Sterlitech 0.2 micron polycarbonate membranes are perfectly suited for this application:

    In February of 2011, an outbreak of Legionnaires' disease infected more than 120 guests of the legendary Playboy Mansion. Investigators determined the culprit was none other than the uninvited guest: Legionella bacterium. We’ve previously discussed how our polycarbonate membrane filters are used by the CDC to detect samples of the legionella bacterium. In addition to traditional detection methods, the CDC also turned to social media in this case to track down those afflicted and to uncover the source of the problem. Through the use of Facebook, Twitter, blogs, and online polling, the CDC was able to identify an outbreak and deduce that it likely originated from a single source. Further investigation narrowed down the exact source to a particular spa, inside the grotto at the Mansion. You can view the presentation about the details of the investigation here.

    In 2012, a published scientific paper from the Journal of Microbial Technology detailed the success of using Sterlitech polycarbonate filters in a rapid detection method for tap water. Legionella can indeed be a tough foe to keep out of our water systems, and Sterlitech polycarbonate membranes, as well as other filter materials, will continue to help researchers keep this tiny bacterium in check.

  9. New NADIR Flat Sheet Membranes

    New NADIR Flat Sheet Membranes

    NADIR flat sheet membranes from Microdyn-NADIR are now available. NADIR Polyethersulfone (PES) membranes are offered in a wide range of MWCO: 4, 5, 10, 20, 30, 50, and 150kDa in addition to the 150kDa Polyvinylidene fluoride (PVDF) and 500kDa Regenerated Cellulose (RC) membranes. Addition of NADIR membranes to the Sterlitech product line fills the gaps in our membrane flat sheet offering MWCO spectrum. NADIR membranes are designed for municipal and industrial applications. These are permanently hydrophilic and chemically resistant, increasing performance and longevity of the membranes and significantly reducing fouling.

    Nadir Flat Sheet Specs

    These new additions are available in large sheets, as well as in precut coupons for use in the Sepa CF filtration cell, CF042 and CF016 filtration cells, and most stirred cells. Custom membrane sizes are also available upon request. For more information about NADIR membranes or if you need assistance to find products suited for a specific application, please contact Sterlitech at browse our complete selection of UF membranes or to place an order with us, click

    1. Hydrophilic Polyethersulfone (PESH)
    2. Polyethersulfone (PES)
    3. Polysulfone (PSUH)
    4. Polyvinylidene fluoride (PVDF)
    5. Regenerated Cellulose (RC)

  10. Get a handle on your liquid storage with our Special Carboy Promo!

    Get a handle on your liquid storage with our Special Carboy Promo!

    Purchase of each package listed on the sheet below includes one carboy, the standard closed-cap and open-cap adapter as well as two additional Quick-Connect VersaCaps, one with 2 hose-barb ports and one with 3 hose-barb ports for easy filling, siphoning, and/or venting.
    PDF Carboy Special Promo Details