Introduction to ErtelAlsop Pak® Lenticular Filters
In the world of industrial liquid filtration, consistency and efficiency are paramount. At Purecowater, we are proud to distribute ErtelAlsop Pak® Lenticular Filters (also known as depth lenticular filter modules). These cartridges represent a significant evolution in filtration technology, combining the superior retention capabilities of depth filter media with the ease of use found in cartridge systems.
Lenticular technology was originally invented by Alsop Engineering in the 1940s and has since become a standard for applications requiring high solids loading and user-friendly operation. Whether you are filtering pharmaceutical, food and beverage, or chemical products, the Pak® design offers a sealed, leak-free alternative to traditional plate and frame filters.
What is a Lenticular Filter?
A “Pak” or lenticular module consists of roughly 5 to 18 individual filter cells stacked vertically. Each cell is constructed from two discs of depth filter media—such as MicroMedia® or AlphaMedia®—whose edges are sealed together using a patented polypropylene molding process. The resulting assembly resembles a stack of double convex lenses, hence the name “lenticular.”
This design allows for a totally enclosed filtration system when paired with the appropriate housing. Unlike open plate and frame presses, lenticular housings prevent product leakage and exposure, making them ideal for high-value or hazardous fluids [ertelalsop.com].
Key Features and Benefits
1. High Solids Loading & Efficiency
The core strength of the ErtelAlsop Pak® lies in its medium. The depth filter sheets utilize a complex matrix of fibers and filter aids (like Diatomaceous Earth) that trap particles not just on the surface, but throughout the thickness of the media. This results in:
- Higher dirt holding capacity compared to surface filters.
- High Zeta Potential: The media exhibits a positive charge, allowing it to electrokinetically capture negatively charged particles (like endotoxins or haze colloids) effectively [clearsolutionscorp.com].
2. The “Zeta-Pak®” Advantage
The Zeta-Pak® is often considered the workhorse of the series. It combines cellulose with diatomaceous earth (and optionally perlite) to provide nominal retention ratings ranging from 0.25 to 15 microns. It is particularly effective for hazy liquids where high flow rates and tight retention are both required [ertelalsop.com].
3. User-Friendly Design
Changing out a traditional filter press can be labor-intensive and messy. In contrast, the Pak® cartridge design allows for rapid changeouts (often in minutes) with minimal downtime. The totally enclosed housing design ensures that the product remains isolated from the environment, improving sanitation and safety.
Technical Specifications
ErtelAlsop cartridges are designed to fit a wide variety of housings and can be customized for specific chemical compatibilities.
| Feature | Specification |
|---|---|
| Diameters | 12-inch (30.5 cm) and 16-inch (40.6 cm) |
| Number of Cells | Typically 16 cells (ranged 5-18) |
| Micron Ratings (Nominal) | 0.25 µm to 15 µm |
| End Cap Configurations | Flat Gasket, Double O-Ring (Code 222/226 equivalent) |
| Core Material | Polypropylene |
| Gasket Material | EPDM (Standard), others available |
| Media Types | MicroMedia® (Cellulose/DE), AlphaMedia® (Pure Cellulose), MicroClear® (Carbon) |
Common Applications
Due to their versatility and scalability, ErtelAlsop Pak® filters are utilized across diverse industries:
- Food & Beverage: Clarification of syrups, wines, beers, and juices. Removal of haze and spoilage organisms.
- Botanical Extracts: Efficient removal of waxes and lipids from solvent-based extractions (ethanol/hydrocarbon) [clearsolutionscorp.com].
- Pharmaceuticals: Pre-filtration and clarification of cell cultures and active ingredients.
- Cosmetics: Filtration of perfumes, lotions, and oils.
- Chemicals: Polishing of inks, varnishes, and resins.
Why Choose Purecowater for Your Filtration Needs?
As a distributor for top-tier filtration manufacturers like Veolia, WTS, and Fil-trek, Purecowater understands the nuances of selecting the right depth matrix for your specific process fluid. We can help you transition from cumbersome filter presses to enclosed lenticular systems, optimizing both your throughput and product quality.
Whether you require the standard Zeta-Pak® for maximum retention or the AlphaMedia™ for highly regulated pharmaceutical applications, we have the expertise to guide your selection.
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