Introduction to ErtelAlsop Pak® Lenticular Filters
In the world of industrial liquid filtration, efficiency and reliability are paramount. ErtelAlsop Pak® Lenticular Filters (also known as depth lenticular filter modules) represent a significant evolution in filtration technology. Designed to provide the high solids loading capacity of traditional plate and frame filters within a user-friendly, totally enclosed cartridge format, these filters are the ideal solution for applications requiring superior retention and ease of operation.
At Purecowater, we understand that selecting the right depth filtration system is critical for your process quality. This guide breaks down the features, specifications, and applications of the ErtelAlsop Pak® series to help you determine the best fit for your needs.
What is a Lenticular Filter?
The ErtelAlsop Pak® design positions depth filter media in a stacked-disc configuration. The module consists of individual “cells”—pairs of filter sheets (such as MicroMedia®, AlphaMedia®, or MicroClear®) sealed together at the edges using a patented polypropylene process. These cells are stacked to form a cartridge that resembles a series of double convex lenses.
Key Advantages Over Plate & Frame Filters
- Totally Enclosed System: Eliminates leakage and external contamination, crucial for pharmaceutical and hazardous applications.
- Rapid Change-Out: Modules can be replaced in a fraction of the time it takes to dress a plate and frame press, significantly reducing downtime.
- Scalability: Available in 12-inch and 16-inch diameters with varying cell counts (5 to 18 cells) to match flow rate requirements.
Media Technologies: Zeta-Pak® vs. Disc-Pak®
ErtelAlsop offers distinct media formulations to target specific contaminants. Understanding the difference between these options is key to optimizing your filtration process.
Zeta-Pak® (The Workhorse)
The Zeta-Pak® is the standard for difficult filtration challenges. It utilizes cellulose fibers impregnated with Diatomaceous Earth (DE) and wet-strength resins. This combination provides a strong positive Zeta potential, allowing the media to attract and hold negatively charged particles (like haze and bacteria) that are smaller than the pore size.
- Best For: Haze removal, ultra-fine particulate retention, and applications requiring high flow rates with tight filtration specs.
- Key Feature: Pre-impregnated DE forms a rigid, porous structure that sieves out particulate without affecting taste or odor.
Disc-Pak® (Organic Purity)
The Disc-Pak® utilizes AlphaMedia®, which is 100% cellulose and contains no inorganic filter aids like DE or Perlite. This series is engineered for applications where ion extraction or mineral leaching must be minimized.
- Best For: Dielectric oils, flavoring syrups, perfumes, and pharmaceutical applications sensitive to inorganic extractables.
Technical Specifications
The Pak® cartridges are designed to fit into standard lenticular housings, offering versatility across existing infrastructure. Below are the standard specifications for these modules.
| Feature | Specification Details |
|---|---|
| Diameters Available | 12 inch (30.5 cm) & 16 inch (40.6 cm) |
| Number of Cells | Stackable from 5 to 18 cells per module |
| Micron Ratings (Nominal) | 0.25 µm to 15 µm (Common ratings: 1µ, 2.5µ, 5µ, 10µ) |
| End Cap Configurations | Double O-Ring or Flat Gasket |
| Core Material | Polypropylene |
| Gasket Material | EPDM, Silicone, Viton, etc. |
| Filtration Type | Depth Filtration (high solids loading) |
Target Applications
Due to the versatility of the media and the robust enclosed design, ErtelAlsop Pak® filters are utilized across a broad spectrum of industries.
Food & Beverage
From distilled spirits to botanical extracts, the Zeta-Pak® is highly effective at removing waxes, lipids, and haze. The DE content ensures a polished finish for consumer products without stripping essential flavors.
Pharmaceuticals & Cosmetics
When product purity is non-negotiable, the enclosed design ensures that the product is never exposed to the environment. The Disc-Pak® is often chosen for cosmetic perfumes and intermediate pharmaceutical steps where cellulose purity is required.
Industrial & Chemical
For processing dielectric oils, coolants, and lubricating oils, these filters remove fine particulates that can degrade equipment performance. The high dirt-holding capacity protects downstream equipment and extends the life of mechanical systems.
Integration with Filter Housings
ErtelAlsop Pak® cartridges are designed to function seamlessly with both vertical and horizontal filter housings.
- Vertical Housings: Standard for many footprint-constrained facilities.
- Horizontal Housings: Feature a “Lock and Load” system for easy operator access and rapid cartridge changes, reducing the physical strain associated with overhead lifting.
Contact Purecowater for Filtration Solutions
Whether you need to replace existing lenticular modules or engineer a new depth filtration skid, Purecowater provides the expertise and equipment to optimize your process. As a distributor for top-tier filtration engineers, we can help assess your specific solids loading and retention requirements.
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