Introduction to ErtelAlsop Pak® Lenticular Filters
In the world of industrial liquid filtration, precision and scalability are paramount. ErtelAlsop Pak® Lenticular Filters (also known as depth filter modules) represent a significant evolution from traditional plate and frame filtration. Designed to provide the high-capacity retention of depth media with the enclosed, leak-proof convenience of a cartridge system, these filters are the “workhorse” for applications ranging from pharmaceutical processing to botanical extraction.
At Purecowater, we distribute the full line of ErtelAlsop lenticular solutions to help facilities utilize depth filtration technology that ensures product purity, clarity, and stability. This guide breaks down the specifications, media types, and advantages of the Pak® cartridge system.
What Is a Lenticular Filter?
The term “lenticular” refers to the lens-like shape of the filter cells. An ErtelAlsop Pak® cartridge consists of multiple stacked filter cells (typically 5 to 18) assembled into a single unit. Each cell is made of two discs of depth filter media sealed at the edges.
Unlike surface filtration, which only traps particles on the top layer, depth filtration utilizes a thick, complex matrix of cellulose fibers, filter aids (like Diatomaceous Earth), and resins. This structure traps particles throughout the entire thickness of the media, offering:
- High Solids Loading: Capable of holding significantly more contaminants than pleated cartridges.
- Zeta Potential: A positive electrokinetic charge that attracts and holds negatively charged sub-micron particles (such as haze or bacteria) that are smaller than the physical pore size.
- Pre-Compression: The modules come pre-compressed, eliminating the manual tightening required by plate and frame presses.
Common Applications
Due to their versatility, ErtelAlsop Pak® filters are used across a wide spectrum of industries. They are particularly effective when efficient particulate removal and haze reduction are critical.
| Industry | Specific Applications |
|---|---|
| Food & Beverage | Clarification of syrups, distilled spirits, wine, and beer; haze removal. |
| Pharmaceuticals | API filtration, cell culture media, and removal of endotoxins or lipids. |
| Botanical Extracts | Removal of waxes and lipids (winterization) using DE-impregnated media. |
| Chemicals & Oils | Filtration of dielectric oils, lubricating oils, and specialty chemicals. |
| Cosmetics | Perfume clarification and essential oil processing. |
Product Series Breakdown
Selecting the right Pak® depends on your fluid characteristics and compatibility requirements. ErtelAlsop offers several specialized media formulations.
Zeta-Pak® (The Standard)
The Zeta-Pak® is the industry standard for depth filtration modules. It utilizes MicroMedia®, which is composed of cellulose, filter aids (Diatomaceous Earth or Perlite), and a wet-strength resin.
Best for: General applications requiring high retention efficiency and positive zeta potential for haze removal.
Disc-Pak® (100% Cellulose)
The Disc-Pak® utilizes AlphaMedia®, which is a pure cellulose media without inorganic filter aids.
Best for: Applications where silica (DE) is not permitted, such as certain pharmaceutical streams, or light viscosity fluids like perfumes and dielectric oils.
MicroClear® (Carbon Impregnated)
These modules contain immobilized activated carbon within the partial cellulosic matrix.
Best for: Decolorization and odor removal without the mess of loose carbon powder.
Technical Specifications
The following table outlines the general specifications for the ErtelAlsop Pak® Lenticular Cartridges available through Purecowater.
| Feature | Specification Details |
|---|---|
| Module Diameters | 12″ (30.5 cm) and 16″ (40.6 cm) |
| Micron Ratings (Nominal) | 0.25µm, 0.45µm, 1.0µm, 2.5µm, 5.0µm, 10µm, 15µm |
| Cell Counts | Typically 5 to 18 cells per stack (Surface area varies by count) |
| Core Material | Polypropylene (Standard) |
| End Cap Configurations | Flat Gasket or Double O-Ring (Fits most standard housings) |
| Gasket Materials | EPDM (Standard), Nitrile, Viton, Silicone available upon request |
| Housing Compatibility | Compatible with vertical and horizontal lenticular housings (12″ or 16″) |
Why Switch to Lenticular Modules?
Many facilities migrate from standard filter presses to lenticular modules to reduce leakage and downtime.
- Closed System: Eliminates edge leakage common in plate and frame filters, ensuring a cleaner production floor and safer handling of hazardous fluids.
- Quick Changeout: Modules can be loaded and unloaded in a fraction of the time it takes to dress a filter press.
- Scalability: Using the 12-inch and 16-inch sizes allows for easy scaling from pilot testing to full production.
Need Help Sizing Your Filtration System?
Whether you are filtering botanical extracts, spirits, or industrial chemicals, Purecowater can help you select the correct media grade and housing configuration.