When it comes to industrial liquid filtration, precision and reliability are non-negotiable. Purecowater is proud to distribute ErtelAlsop Pak® Lenticular Filters, a premier solution for depth filtration applications ranging from food and beverage processing to critical pharmaceutical manufacturing.
This article provides an in-depth look at the ErtelAlsop Pak® technology, technical specifications, and application suitability to help you determine the right configuration for your filtration needs.
What Are Lenticular Pak® Filters?
ErtelAlsop Pak® Cartridges (often referred to as lenticular modules) are depth filter cartridges constructed from stacked filter cells. Unlike traditional plate and frame filters, which are open to the environment, lenticular cartridges operate inside a sealed housing. This design eliminates leakage, reduces oxidation, and significantly simplifies the change-out process.
Each “Pak” consists of multiple filter cells stacked on a central core. The edges of these cells are sealed using a patented process (typically polypropylene injection molding) to create a rugged, integral unit that resembles a stack of double convex lenses—hence the name “lenticular”.
Core Benefits
- Enclosed System: Prevents exposure to the atmosphere, protecting both the product and the operator.
- High Solids Loading: The depth media structure traps potential contaminants throughout the thickness of the pad, not just on the surface.
- Scalability: Available in 12-inch and 16-inch diameters with varying cell counts to match flow rate requirements.
- Zero Bypass: The patented edge sealing technology helps ensure all liquid passes through the media.
Media Formulations: Zeta-Pak® vs. Disc-Pak®
Selecting the correct media formulation is critical for process efficiency. ErtelAlsop offers distinct media series allowing for targeted filtration.
1. Zeta-Pak® (Micro-Media®)
The Zeta-Pak® is the industry workhorse. It utilizes Micro-Media®, a formulation of cellulose, diatomaceous earth (DE), and wet-strength resin. [clearsolutionscorp.com]
- Mechanism: Combines mechanical straining with electrokinetic adsorption (Zeta Potential).
- Zeta Potential: The media holds a positive charge, attracting negatively charged contaminants (like bacteria and haze-forming colloids) that are smaller than the micron rating.
- Best For: Haze removal in spirits, botanical extracts (wax/lipid removal), and general chemical clarification.
2. Disc-Pak® (AlphaMedia™)
The Disc-Pak® is constructed using AlphaMedia™, which is 100% cellulose [clearsolutionscorp.com]. It contains no diatomaceous earth or perlite.
- Mechanism: Pure mechanical depth filtration.
- Purity: Ideal for applications where inorganic filter aids (like DE) are not permitted or where active ingredients must be preserved.
- Best For: Dielectric oils, perfumes, certain organic syrups, and pharmaceutical applications requiring low extractables.
Technical Specifications
ErtelAlsop cartridges are versatile and can fit into most industry-standard lenticular housings. Below are the standard specifications available through Purecowater.
| Feature | Specification Details |
|---|---|
| Available Diameters | 12 inch (30.5 cm) & 16 inch (40.6 cm) |
| Micron Ratings (Nominal) | 0.25 µm – 15 µm (Common: 0.45, 1.0, 2.5, 5.0, 10.0) |
| End Cap Configurations | Flat Gasket or Double O-Ring (Code 8 style) |
| Core Material | Polypropylene (standard) |
| Gasket Material | EPDM, Buna-N, Viton, Silicone |
| Number of Cells | Typically 5 to 18 cells per module (16 is common for standard packs) [ertelalsop.com] |
Note: Over 300 precision dies are available to fit virtually any filter press or housing configuration if custom dimensions are required.
Applications
The versatility of the Pak® cartridge makes it suitable for diverse industries. Here is where the product shines:
Botanical Extracts & CBD
Lenticular filters are a staple in winterization and dewaxing processes. The high surface area allows for rapid flow rates while the Micro-Media helps adsorb lipids and waxes that cause cloudiness in the final product [clearsolutionscorp.com].
Food & Beverage
From distilled spirits to sugar syrups, the Zeta-Pak® is used for polishing filtration. It effectively removes haze without stripping flavor profiles. The wide range of retention ratings allows producers to dial in the clarity of their beverage precisely.
Pharmaceuticals & Cosmetics
For high-value fluids like perfumes or active pharmaceutical ingredients (APIs), the Disc-Pak® (AlphaMedia) provides a clean, cellulose-based matrix that minimizes adsorption of desired active compounds while removing particulate contamination.
Why Choose ErtelAlsop?
ErtelAlsop has been a leader in liquid filtration since the 1920s. Their patented manufacturing process for joining filter cells ensures that their lenticular cartridges are robust and reliable. By sealing the edges with polypropylene molding, the risk of bypass—common in lower-quality stacked disc modules—is virtually eliminated.
Whether you need to remove activated carbon fines, polish a final product, or protect downstream membrane filters, the variety of grades (0.25 to 15 microns) ensures there is a solution for your specific challenge.
Need help selecting the right Micron Rating or Media Type?
Purecowater can assist you in sizing your housing and selecting the optimal ErtelAlsop cartridge for your specific stream.