High-Efficiency Depth Filtration Modules
ErtelAlsop Pak® Lenticular Filters, also known as depth filter modules, represent a significant evolution in filtration technology. Designed to combine the superior filtration characteristics of depth media with the convenience of a cartridge format, these filters are the ideal solution for applications requiring high solids loading, varying flow rates, and a sealed, leak-free environment. Purecowater offers these modules as a modern alternative to traditional plate and frame filter usage.
What is a Lenticular Filter?
The term “lenticular” refers to the shape of the filter cells. A Pak® cartridge is assembled from multiple stacked filter cells (typically 12 or 16 inches in diameter). Each cell consists of two sheets of depth filter media (such as MicroMedia® or AlphaMedia®) sealed together at the edges using a patented polypropylene molding process.
This construction resembles a stack of double convex lenses. The result is a robust, self-contained module that fits inside a closed housing, eliminating the drips, leakage, and exposure to the atmosphere often associated with open plate and frame assemblies.
Key Features and Media Options
ErtelAlsop Pak® cartridges are versatile and customizable to fit specific industrial needs. They are available in various configurations to ensure chemical compatibility and precise filtration targets.
- Zeta Potential: Many media options, such as the Zeta-Pak®, possess a positive charge (zeta potential) that attracts and holds negatively charged contaminants like bacteria and mist, removing ultra-fine particles smaller than the mechanical rating of the filter.
- High Solids Loading: The complex matrix of fibers and filter aids (like Diatomaceous Earth or Perlite) within the media provides a high capacity for holding solids before plugging.
- Scalability: With sizes available in 12-inch and 16-inch diameters and cell counts ranging from 5 to 18 stacks, systems can be scaled from pilot lab testing to full production flow rates.
Technical Specifications
Below is a breakdown of the standard specifications for the ErtelAlsop Pak® series available through Purecowater.
| Parameter | Specification |
|---|---|
| Micron Ratings | 0.25 µm to 15 µm (Nominal) |
| Diameters Available | 12-inch (30.5 cm) & 16-inch (40.6 cm) |
| End Cap Configurations | Flat Gasket or Double O-Ring (Code 8 style) |
| Core Material | Polypropylene |
| Gasket Material | EPDM (Standard), others available upon request |
| Cell Count | Typically 16 cells (Configurable from 5 to 18) |
| Filter Media Types | MicroMedia® (Cellulose/DE/Resin), AlphaMedia® (All Cellulose), MicroClear® (Carbon) |
Common Applications
Because of their enclosed design and media versatility, ErtelAlsop Pak® filters are used heavily in regulated industries where cleanliness and product purity are paramount.
- Botanical Extraction: Highly effective for dewaxing and lipid removal. The diatomaceous earth media absorbs waxes while allowing high flow rates of solvents (such as ethanol).
- Pharmaceuticals (API): Removal of carbon (using MicroClear®) and haze from active pharmaceutical ingredients.
- Food & Beverage: Polishing filtration for distilled spirits, syrups, and edible oils to remove haze and ensure shelf stability.
- Cosmetics: Clarification of perfumes and essential oils.
- Chemical Utilities: Purification of process water and protection of downstream membrane equipment.
Comparison: Lenticular vs. Plate & Frame
While both technologies use depth filter media to achieve similar retention results, the operational differences are significant.
| Feature | Plate & Frame Filter | Lenticular Pak® Module |
|---|---|---|
| System Type | Open System (Edge leakage possible) | Totally Enclosed (Zero leakage) |
| Change-out Time | High (Hours labor) | Low (Minutes) |
| Hygiene | Product exposed to air | Sanitary Design available |
If you are looking to upgrade your current filtration skid or need a reliable solution for haze removal and polishing, the ErtelAlsop Pak® series provides a proven, high-performance option.
Need help selecting the right micron rating or media configuration for your process?
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