Introduction to ErtelAlsop Pak® Lenticular Filters
For industries requiring high-purity filtration with efficient solids loading, ErtelAlsop Pak® Lenticular Filters represent a premier solution in depth filtration technology. As an enclosed alternative to traditional plate and frame filters, these lenticular cartridges (also known as modules) offer the superior retention capabilities of depth filter sheets in a convenient, easy-to-handle cartridge format.
At Purecowater, we understand that selecting the right filtration method is critical for process efficiency and product quality. This guide breaks down the specifications, benefits, and applications of ErtelAlsop Pak® filters to help you determine the best fit for your liquid processing needs.
What is a Lenticular Filter?
The ErtelAlsop Pak® is a depth filter cartridge assembled from varying numbers of stacked filter cells. Each cell is composed of a pair of depth filter sheets (such as MicroMedia® or AlphaMedia®) with edges sealed using a patented process, typically polypropylene injection molding. The resulting stack resembles a series of double convex lenses, giving rise to the name “lenticular.”
This design allows the fluid to flow from the outside of the cartridge, through the media, and into the center core, effectively trapping particulates within the complex matrix of fibers.
Key Benefits
- Scalability: Available in 12-inch and 16-inch diameters with 5 to 18 cells per module, offering over 300 configurations to fit virtually any housing.
- Zero Leakage: The totally enclosed housing eliminates edge leakage and external contamination often associated with plate and frame presses.
- High Solids Loading: The depth media provides a high capacity for holding solids, ideal for clarifying liquids with haze or particulate matter.
- Rapid Change-Out: Modules are easy to load and unload, significantly reducing labor costs and downtime compared to changing loose filter sheets.
Technical Specifications
ErtelAlsop Pak® cartridges are designed to be versatile, fitting into standard lenticular housings. Below are the core specifications for the product line.
| Feature | Specification |
|---|---|
| Filter Type | Depth Filtration (Nominal Rating) |
| Micron Ratings | 0.25 µm to 15 µm |
| Diameters | 12-inch (30.5 cm) and 16-inch (40.6 cm) |
| Core Material | Polypropylene (Standard) |
| Gasket Materials | EPDM, Viton, Silicone, Nitrile |
| End Cap Configurations | Flat Gasket, Double O-Ring |
| Cell Count | Typically 5 to 18 stacked cells |
Media Formulations and Variants
ErtelAlsop offers distinct media types within the Pak® cartridge format to target specific contaminants and applications.
1. Zeta-Pak® (The Workhorse)
The Zeta-Pak® is manufactured with Micro-Media®, which contains cellulose, high-purity Diatomaceous Earth (DE), and wet-strength resin. Use this for superior retention of ultra-fine particles and haze removal.
- Best For: Distilled spirits, pharmaceuticals, botanical extracts, and general haze removal.
- Note: The DE aids in forming a rigid purity cake that does not alter taste or odor.
2. Disc-Pak® (Cellulose Only)
The Disc-Pak® utilizes AlphaMedia®, which is 100% cellulose and contains no resins, binders, or inorganic filter aids like DE or Perlite.
- Best For: Dielectric oils, lubricating oils, perfumes, and applications where active ingredients must be preserved without adsorption by inorganic aids.
3. Bio-Pak® and AquaKv-Pak®
Designed for specialized biological and high-purity water applications where specific retention efficiencies and low extractables are required.
Common Applications
The versatility of the Pak® Lenticular system makes it a staple in various industrial sectors:
- Pharmaceuticals: Clarification of syrups, bulk active ingredients, and pre-filtration for membrane protection.
- Food & Beverage: Polishing filtration for distilled spirits, wine, beer, and high-fructose corn syrups.
- Botanical Extracts: Removal of waxes and lipids from ethanol extracts using DE-impregnated media.
- Chemicals & Utilities: Filtration of dielectric oils, amine solutions, and process water in power generation.
- Cosmetics: Clarification of perfumes, colognes, and lotions.
Lenticular vs. Plate & Frame: Why Upgrade?
Many facilities upgrade from Plate & Frame filter presses to Lenticular Pak® systems to improve hygiene and operational efficiency.
| Feature | Plate & Frame Filter | ErtelAlsop Pak® Lenticular |
|---|---|---|
| System Design | Open atmosphere (drip tray required) | Totally enclosed housing |
| Product Loss | Potential for leakage/dripping | Minimal to zero loss |
| Change-Out Time | Hours (manual sheet handling) | Minutes (modular swap) |
| Footprint | Large, horizontal space | Compact, vertical orientation |
Ready to Improve Your Filtration Process?
Whether you are filtering botanical extracts, industrial fluids, or beverages, the ErtelAlsop Pak® Lenticular Filter offers a robust, leak-free solution. Purecowater can assist you in selecting the correct micron rating, media type, and housing configuration for your specific flow rate and retention requirements.
Need a quote or technical advice?
Contact Purecowater Today