Advanced Depth Filtration with ErtelAlsop Pak® Lenticular Filters
For industries requiring high-efficiency particulate retention and superior solids loading capacity, the ErtelAlsop Pak® Lenticular Filter represents the evolution of depth filtration technology. As a distributor for top-tier filtration solutions, Purecowater provides these advanced lenticular modules to replace traditional plate and frame systems with a more sealed, user-friendly, and efficient alternative.
The Lenticular Pak® cartridge, originally developed by Alsop Engineering, combines the proven filtration performance of depth filter sheets with the ease of use of a cartridge design. This guide details the specifications, media options, and applications of these robust filters.
What is a Lenticular Filter?
A “Pak” or lenticular cartridge is an assembly of stacked filter cells. Each cell is constructed from two depth filter sheets (such as MicroMedia® or AlphaMedia®) with their edges sealed using a patented polypropylene process. The resulting unit resembles a stack of double convex lenses—hence the term “lenticular.”
Unlike surface filters that trap particles only on the outer layer, these depth filters utilize a complex matrix of cellulose, and optionally Diatomaceous Earth (DE) or Perlite, to trap contaminants throughout the entire thickness of the media [ertelalsop.com]. This provides nominal retention ratings ranging from 0.25 to 15 microns.
Key Benefits Over Plate and Frame Filters
While plate and frame filters have been industry workhorses, ErtelAlsop Pak® cartridges offer significant operational advantages:
- Enclosed System: The totally enclosed housing design eliminates leakage and exposure to the environment, making it ideal for pharmaceutical, cosmetic, and hazardous chemical applications [ertelalsop.com].
- Reduced Downtime: Changing out a Pak cartridge is significantly faster than manually replacing dozens of sheets in a filter press, reducing labor costs and production downtime.
- Scalability: Available in 12-inch and 16-inch diameters with varying cell counts (5 to 18 cells), these filters can be scaled to fit “Lock and Load” horizontal housings or vertical sanitary housings [ertelalsop.com].
Media Formulations and Options
ErtelAlsop offers distinct media compositions to suit specific chemical compatibility and filtration goals. Choosing the right media is critical for optimizing throughput and product quality.
| Media Series | Composition | Primary Applications |
|---|---|---|
| AlphaMedia™ | 100% Cellulose (No DE/Perlite) | Dielectric oils, perfumes, syrups, and applications where inorganic extractables are a concern [clearsolutionscorp.com]. |
| MicroMedia® | Cellulose + Filter Aid (DE/Perlite) | The workhorse series. Ideal for haze removal, high solids loading, and clarifying beverages or botanical extracts [store.clearsolutionscorp.com]. |
| MicroClear® | Activated Carbon Impregnated | Color, odor, and flavor correction without the mess of bulk carbon powder. |
| Pharma Grade | High Purity Composition | Life sciences and pharmaceutical applications requiring low extractables. |
Technical Specifications
Below are the standard operating specifications for ErtelAlsop Pak® Lenticular Cartridges. These modules are designed to fit into most standard industry housings.
| Diameters Available | 12 inch (30.5 cm) & 16 inch (40.6 cm) |
|---|---|
| Number of Cells | Typically 5 to 18 stacked cells per module |
| Micron Ratings (Nominal) | 0.25 µm to 15 µm [ertelalsop.com] |
| End Cap Configurations | Flat Gasket or Double O-Ring (Code 3, Code 8 styles available) |
| Core Material | Polypropylene (Standard), Stainless Steel optional for specific applications |
| Gasket Materials | EPDM, Buna-N, Silicone, Viton, etc. |
| Sterilization | In-line steam sterilization or hot water sanitization capable |
Common Applications
The versatility of the Pak® depth filter allows it to perform in diverse industrial sectors:
- Botanical Extracts: High flow rates and efficient removal of waxes and lipids using DE-impregnated media [store.clearsolutionscorp.com].
- Food & Beverage: Clarification of distilled spirits, syrups, soft drinks, and chill-haze removal.
- Pharmaceuticals: Pre-filtration for protection of final membrane filters and decolorization steps.
- Chemicals & Utilities: Filtration of dielectric oils (transformer oil) and amine solutions.
Housing Compatibility
These cartridges are compatible with ErtelAlsop’s range of lenticular housings, including:
- Vertical Housings: Standard footprint for general industrial or sanitary use.
- Horizontal Housings: Featuring the “Lock and Load” design for easy single-operator loading, which reduces overhead hoist requirements and minimizes product loss [ertelalsop.com].
Contact Purecowater for Filtration Solutions
Whether you require a retrofit for an existing plate and frame system or a completely new lenticular filtration skid, Purecowater can engineer the right solution using ErtelAlsop technology.