Introduction to ErtelAlsop Pak® Lenticular Filters
In the world of industrial liquid filtration, consistency and efficiency are paramount. The ErtelAlsop Pak® Lenticular Filter represents a significant evolution in depth filtration technology. Originally pioneered by Alsop Engineering, the lenticular format offers a totally enclosed, scalable, and operator-friendly alternative to traditional plate and frame filter presses.
Purecowater is proud to distribute these high-performance modules, designed to tackle rigorous applications ranging from pharmaceutical processing to botanical extraction. Whether you are dealing with high solids loading or require pharmaceutical-grade purity, the Pak® cartridges provide a versatile solution. ertelalsop.com
What is Lenticular Filtration?
A “Pak” or lenticular module consists of stacked filter cells (discs). Each cell is constructed from a pair of depth filter media sheets (such as MicroMedia® or AlphaMedia®) sealed at the edges. This design resembles a stack of double convex lenses—hence the term “lenticular.”
The fluid flows from the outside of the cartridge, through the media, and into the hollow central core. This design maximizes surface area while minimizing the footprint, allowing for high flow rates and efficient particle retention in a closed system.
“The workhorse of ErtelAlsop Pak filter cartridges, the Zeta-Pak® lenticular filter module can be used in virtually any application, as it provides the greatest retention efficiencies of all media series.”
Key Features and Benefits
- High Solids Loading: The complex matrix of fibers provides excellent holding capacity for particulate matter.
- Enclosed System: Unlike open plate and frame presses, lenticular housings prevent leakage and limit exposure to the atmosphere—crucial for sanitary applications and preventing product loss.
- Scalability: With over 300 precision dies available and modular stacking (1 to 4 modules high), systems can be sized for lab-scale to full production.
- Ease of Use: Change-outs are significantly faster than plate and frame filters, reducing downtime and labor costs.
Product Specifications and Configurations
ErtelAlsop Pak® cartridges are highly customizable. Below are the standard specifications available for industrial and sanitary applications.
| Specification | Details |
|---|---|
| Diameter Options | 12 inch (30.5 cm) and 16 inch (40.6 cm) |
| Micron Ratings | Nominal retention from 0.25 to 15 microns |
| Number of Cells | 5 to 18 cells per module (depending on cake space requirements) |
| Core Material | Polypropylene (standard) |
| End Modifications | Flat Gasket or Double O-Ring (222/226 style) |
| Gasket Materials | EPDM, Buna-N, Viton, Silicone, Teflon Encapsulated |
Media Types: Customizing for Your Application
Choosing the right media is critical for optimal filtration performance. ErtelAlsop offers three primary formulations:
1. Zeta-Pak® (Micro-Media® Series)
The Zeta-Pak is the industry standard for high-efficiency depth filtration. It utilizes a wet-strength cellulose fiber matrix impregnated with Diatomaceous Earth (DE) or Perlite filter aids. The media possesses a positive zeta potential, allowing it to electrokinetically attract negatively charged contaminants (like bacteria and endotoxins) that are smaller than the pore size. clearsolutionscorp.com
- Best For: Haze removal in spirits, biopharmaceuticals, and general clarifying.
2. Disc-Pak® (AlphaMedia® Series)
Disc-Pak cartridges are composed of 100% cellulose fibers with no inorganic filter aids (no DE or Perlite). This makes them ideal for applications where mineral extractables are a concern or where active ingredients must be preserved without adsorption by DE.
- Best For: Lubricating oils, dielectric oils, perfumes, and syrups. clearsolutionscorp.com
3. Bio-Pak® (MicroClear® Series)
The Bio-Pak series incorporates activated carbon into the depth filter matrix. This allows for color, odor, and flavor correction in a single pass without the mess of handling loose carbon powder.
- Best For: Decolorization of pharmaceuticals, vodkas/spirits, and organic solvent purification.
Common Applications
The versatility of the Pak® cartridge line makes it suitable for a wide array of industries:
- Food & Beverage: Polishing filtration for distilled spirits, wine, syrups, and soft drinks.
- Botanical Extracts: Removal of waxes and lipids from ethanol extractions. The high flow rates and efficient lipid removal of the Zeta-Pak make it a favorite in this sector.
- Pharmaceuticals & Cosmetics: Final clarification of lotions, fragrances, and active pharmaceutical ingredients (APIs).
- Chemical & Industrial: Filtration of varnishes, resins, and cooling fluids.
Housing Compatibility: Lock and Load
For the best user experience, these cartridges are often paired with ErtelAlsop’s “Lock and Load” horizontal filter housings. This design eliminates the need for overhead hoists and uses Teflon guides to allow a single operator to slide cartridges in and out easily, further reducing maintenance downtime. ertelalsop.com
Solve Your Filtration Challenges Today
Whether you are replacing an archaic plate and frame press or designing a new filtration skid, Purecowater can help you select the precise ErtelAlsop Pak® configuration for your process.
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