Introduction to ErtelAlsop Pak® Lenticular Filters
In the world of industrial liquid filtration, efficiency and scalability are paramount. ErtelAlsop Pak® Lenticular Filters represent a premium standard in depth filtration technology. Designed to combine the superior retention capabilities of traditional depth filter sheets with the convenience of an enclosed modular cartridge system, these filters are a go-to solution for industries ranging from pharmaceuticals to botanical extraction.
At Purecowater, we specialize in solving complex solid and liquid filtration challenges. As a distributor for high-performance filtration solutions, we provide ErtelAlsop Pak cartridges to facilities looking to upgrade their clarification and particulate removal processes.
What is a Lenticular Filter?
Lenticular filtration technology bridges the gap between plate and frame filters and standard cartridge filtration. The “Pak” (or module) is constructed from multiple depth filter cells stacked vertically.
Each cell consists of two circular sheets of depth filter media sealed at the edges using a patented process (typically polypropylene). This assembly resembles a double convex lens—hence the term “lenticular.” These modules accept fluid from the outside of the housing, forcing it through the media into a central core, effectively capturing contaminants within the thick matrix of the filter sheet.
Key Advantages:
- High Solids Loading: The depth media structure traps particles throughout its thickness, not just on the surface.
- Hermetic Sealing: Unlike plate and frame filters which can leak, lenticular housings are enclosed, preventing product loss and exposure.
- Rapid Changeout: Modules are easily installed and removed, significantly reducing downtime compared to changing dozens of individual sheets.
Media Configurations: Zeta-Pak® and Disc-Pak®
ErtelAlsop Pak filters are available in different media formulations to suit specific chemical compatibility and filtration goals.
1. Zeta-Pak® (Micro-Media® Series)
The Zeta-Pak® is the industry workhorse. It utilizes ErtelAlsop’s Micro-Media®, which is composed of cellulose, a filter aid (such as Diatomaceous Earth or Perlite), and a wet-strength resin.
- Mechanism: It relies on electrokinetic adsorption (Zeta Potential) to capture ultra-fine particles, including haze and lipids, that are smaller than the mechanical rating of the filter.
- Best For: Botanical extracts (winterization/dewaxing), pharmaceuticals, distilled spirits, and haze removal.
2. Disc-Pak® (AlphaMedia™ Series)
The Disc-Pak® utilizes AlphaMedia™, which is 100% pure cellulose without the addition of inorganic filter aids like DE or Perlite.
- Mechanism: Mechanical sieving and adsorption without the risk of altering active ingredients or imparting mineral content.
- Best For: Dielectric oils, lubricating oils, perfumes, and applications where inorganic extractables must be avoided.
Technical Specifications
Understanding the technical capabilities of the ErtelAlsop Pak helps in selecting the correct module for your process stream. Below is a breakdown of the standard specifications available through Purecowater.
| Feature | Specification Details |
|---|---|
| Diameters Available | 12-inch (30.5 cm) and 16-inch (40.6 cm) |
| Micron Ratings (Nominal) | 0.25 µm to 15 µm |
| Cell Count (stack height) | Configurable from 5 to 18 cells per module |
| End Cap Styles | Flat Gasket or Double O-Ring (standard industry fitments) |
| Core Material | Polypropylene (Standard), 316L SS (Optional) |
| Gasket Materials | EPDM, Buna-N, Viton, Silicone |
| Media Type | Micro-Media (Cellulose/DE), AlphaMedia (Cellulose only), MicroClear (Carbon) |
Common Applications
The versatility of the Pak® cartridge allows it to be deployed across various demanding sectors.
Botanical Extraction
Specifically used for winterization and dewaxing. The Diatomaceous Earth (DE) impregnated in the Zeta-Pak® excels at retaining lipids and waxes from ethanol extracts, ensuring a clear, high-quality oil.
Food & Beverage
Used for the clarification of wines, spirits, syrups, and edible oils. The closed system ensures sanitary processing and protects the product from oxidation or airborne contamination.
Pharmaceuticals
Ideal for Pre-filtration and API processing. The high retention efficiency protects expensive downstream membrane filters, extending their lifespan significantly.
Why Choose ErtelAlsop Paks?
Depth filtration is often the most economical way to handle fluids with a high contaminant load. While surface filters (pleated cartridges) clog rapidly under such conditions, the ErtelAlsop Pak utilizes the entire depth of the media matrix to hold solids. This results in:
- Longer Service Life: High dirt-holding capacity reduces changeout frequency.
- Product Safety: Manufacturing complies with CFR standards for food contact.
- Scalability: Methods developed on a 12″ module can be linearly scaled to larger multi-round housings for high-flow production.
Solve Your Filtration Challenges with Purecowater
Whether you require the zeta potential of the Zeta-Pak for fine haze removal or the chemical purity of the Disc-Pak for sensitive oils, Purecowater can assist in sizing and specifying the correct filtration train for your facility.
Need help selecting the right micron rating or media type?