Introduction to ErtelAlsop Pak® Lenticular Filters
In the world of industrial and sanitary liquid filtration, efficiency and ease of use are paramount. ErtelAlsop Pak® Lenticular Filters (also known as depth filter modules or cartridges) represent a premium solution for applications requiring high solids loading capacity and superior particle retention. Purecowater is proud to technically support and supply these filtration systems, helping industries ranging from pharmaceuticals to food and beverage optimize their separation processes.
This article provides an in-depth look at the ErtelAlsop Pak® series, detailing how they function, their technical specifications, and why they are often the preferred choice over traditional plate and frame filter presses.
What are Lenticular Pak® Cartridges?
ErtelAlsop Lenticular Pak® Cartridges are depth filtration modules designed in a stacked-disc configuration. Unlike surface filters that trap particles only on the outer layer, these depth filters utilize a tortuous path through a thick media matrix to trap contaminants throughout the entire depth of the filter bed.
The “Lenticular” design consists of individual filter cells stacked vertically. Each cell is formed by two discs of depth filter media (such as MicroMedia®, AlphaMedia®, or MicroClear®) sealed around the edges. This assembled unit resembles a stack of double convex lenses, maximizing surface area within a compact footprint.
Key Advantages Over Plate & Frame Filters
- Closed System: Lenticular housings are fully enclosed, preventing fluid loss and protecting operators from exposure to the process fluid.
- Quick Changeouts: Replacing a module takes a fraction of the time compared to manually dressing a plate and frame press with filter sheets.
- Scalability: Modules come in standard 12-inch and 16-inch diameters, easily scalable from pilot to production.
The Science of Filtration: Zeta Potential
One of the standout features of the ErtelAlsop Zeta-Pak® series is the utilization of Zeta Potential. The filter media is composed of cellulose fibers and filter aids (like Diatomaceous Earth or Perlite) impregnated with a wet-strength resin that imparts a positive electrokinetic charge.
Most contaminants in liquid streams (such as bacteria, haze, and sub-micron particles) carry a negative charge. The positive Zeta potential of the media acts like a magnet, adsorbing these fine particles even if they are smaller than the physical pore size of the filter. This results in ultra-fine “polishing” filtration capability.
Technical Specifications
ErtelAlsop Pak® cartridges are highly customizable to fit precise process requirements. Below are the general specifications for the product line available through Purecowater.
| Feature | Specification |
|---|---|
| Module Diameters | 12 inch (30.5 cm) & 16 inch (40.6 cm) |
| Micron Ratings (Nominal) | 0.25 µm to 15 µm |
| End Cap Configurations | Flat Gasket, Double O-Ring (Code 222/226 equivalent styles) |
| Core Material | Polypropylene (Standard) |
| Gasket Material | EPDM (Standard), others available upon request |
| Filter Media Types | MicroMedia® (Cellulose/DE/Perlite), AlphaMedia® (Pure Cellulose), MicroClear® (Carbon Impregnated) |
| Operating Temperature | Ambient to 180°F (depending on gaskets and polymer selection) |
Common Applications
Due to their versatility and varying grades of media, ErtelAlsop Pak filters are used across a wide spectrum of industries.
1. Botanical Extracts & Winterization
In the processing of botanical extracts, removing waxes, lipids, and fine particulate is critical. The Zeta-Pak® with embedded Diatomaceous Earth is an industry standard for “winterization,” effectively clarifying extracts without affecting the desirable chemical profile of the product.
2. Food & Beverage
- Distilled Spirits: Haze removal and polishing for crystal clarity.
- Sugar Syrups: Removal of particulates and decolorization (using MicroClear® carbon media).
- Wine & Beer: Microbial stabilization and clarification.
3. Pharmaceuticals & Cosmetics
Lenticular modules are produced in pharmaceutical-grade options for critical applications, ensuring compliance with strict sanitary standards. They are widely used for the filtration of fragrances, essential oils, and API slurries.
4. Chemical & Industrial
From removing catalyst fines to general chemical clarification, the robust polypropylene core allows for compatibility with a wide range of solvents and chemicals.
Choosing the Right Configuration
Selection depends on your specific flow rate and retention requirements.
- 12-Inch Modules: Ideal for smaller batches or lower flow rates.
- 16-Inch Modules: Designed for high-volume production environments.
- Carbon Grades: Choose MicroClear® modules if your application requires adsorption of colors, odors, or off-tastes, eliminating the need for loose activated carbon powder.
Contact Purecowater for Sizing and Quotes
Purecowater specializes in solving complex solid and liquid filtration problems. Whether you need to retrofit an existing housing or require a complete skid-mounted lenticular filtration system, engineering expertise is available to guide you.
For inventory inquiries, technical data sheets, or to discuss your specific application application, please reach out to our team.