For industries requiring high-performance liquid filtration with superior solids loading capacity, ErtelAlsop Pak® Lenticular Filters represent a significant evolution in depth filtration technology. As a distributor for top-tier filtration manufacturers, Purecowater is proud to offer these versatile modules which combine the reliability of traditional plate and frame filtration with the convenience of a totally enclosed cartridge system.
This guide explores the features, specifications, and operational benefits of the ErtelAlsop lenticular technology available through Purecowater.
What are Lenticular Pak® Cartridges?
ErtelAlsop Pak® depth filter cartridges (also known as modules) are precision-engineered filtration units constructed from stacked depth filter cells. Unlike surface filters that only trap particles on the exterior, these depth filters utilize a complex matrix of cellulose fibers, filter aids (such as Diatomaceous Earth or Perlite), and resins to trap contaminants throughout the thickness of the media [ertelalsop.com].
The term “lenticular” refers to the shape of the individual cells, which resemble double convex lenses. These cells are stacked to form a cartridge, typically ranging from 5 to 18 cells per unit, and are known in the industry as the “Pak®” design—a format originally invented by Alsop Engineering in the 1940s [ertelalsop.com].
Key Features and Benefits
Switching to a lenticular format offers distinct advantages over traditional filtration methods like filter presses.
- Closed Loop System: The totally enclosed housing design eliminates leakage and exposure to the atmosphere, making it ideal for processing hazardous fluids, distilled spirits, or pharmaceutical products where hygiene and vapor containment are critical.
- High Solids Loading: The depth media structure allows for a high concentration of particles to be retained, often far exceeding surface retention media capabilities.
- Zeta Potential: Many ErtelAlsop media formulations, such as the Zeta-Pak®, exhibit a positive Zeta potential. This electrokinetic charge attracts and captures negatively charged particles (like haze or fine bacteria) that are smaller than the physical pore size of the filter [ertelalsop.com].
- User-Friendly Changeout: Unlike plate and frame filters which can be labor-intensive to clean and reload, lenticular modules can be swapped out quickly, significantly reducing downtime [ertelalsop.com].
Product Specifications
ErtelAlsop cartridges are highly customizable to fit various process requirements, from pharmaceutical production to botanical extraction.
| Feature | Specification Details |
|---|---|
| Diameter Options | 12-inch (30.5 cm) and 16-inch (40.6 cm) |
| Micron Ratings (Nominal) | 0.25, 0.3, 0.45, 0.8, 1.0, 2.5, 5, 10, 15 µm |
| Media Types | MicroMedia® (Cellulose/Perlite/DE) AlphaMedia® (All-Cellulose) MicroClear® (Carbon Impregnated) |
| End Cap Configurations | Flat Gasket, Double O-Ring (typically 222 or 226 style bayonet) |
| Gasket Material | EPDM (Standard), others available upon request |
| Core Material | Polypropylene |
Popular Media Formulations
- Zeta-Pak®: The industry workhorse providing high flow rates and superior retention of ultra-fine particles using positive Zeta potential.
- Bio-Pak®: Designed for biological and pharmaceutical applications requiring strict quality control.
- AlphaMedia™: A cellulose-only option, ideal for applications where mineral filter aids (like DE) are not permitted [ertelalsop.com].
Applications
The versatility of the Pak® Lenticular Filter makes it a staple in numerous industries:
- Food & Beverage: Haze removal in distilled spirits, syrups, and wine.
- Botanical Extracts: Efficient removal of waxes and lipids in ethanol extraction processes [clearsolutionscorp.com].
- Pharmaceuticals: Clarification of active pharmaceutical ingredients (API) and LVPs.
- Chemicals: Polishing of specialty chemicals and solvents.
- Cosmetics: Filtration of fragrances and large-batch lotions.
Housing Compatibility
These cartridges are designed to fit into Lenticular Filter Housings, which are available in both vertical and horizontal orientations. The Horizontal Filter Housing is particularly popular for its “Lock and Load” system, allowing for single-person operation and easier access during changeouts [ertelalsop.com].
Optimize Your Filtration Process Today
Whether you need to upgrade from a manual filter press or require a specific micron rating for a new extraction line, Purecowater can engineer the right solution for you. As an authorized distributor, we provide full support for ErtelAlsop products alongside our other offerings from Veolia and LG membranes.
Ready to improve your filtration efficiency?