ErtelAlsop Pak Lenticular Filters: High-Performance Depth Filtration

Advanced Depth Filtration for Critical Applications

At Purecowater, we specialize in solving complex solid and liquid filtration challenges. Among our premier offerings are the ErtelAlsop Pak® Lenticular Filters. Designed for versatility and high-capacity retention, these depth filter modules are the industry standard for applications ranging from botanical extraction and pharmaceuticals to food and beverage processing.

What is a Lenticular Filter?

Lenticular filters bridge the gap between standard cartridge filters and plate-and-frame filter presses. They utilize depth filtration technology housed within a closed, stackable module. Each "Pak" consists of multiple lenticular cells stacked vertically.

The design creates a tortuous path for fluid flow, maximizing contact time with the media. This allows the filter to retain particles not just on the surface, but throughout the entire thickness of the media matrix. The result is superior solids holding capacity and the ability to remove ultra-fine haze and contaminants.

Key Features and Technologies

ErtelAlsop’s technology stands out due to the integration of proprietary media formulations and structural advantages.

• Zeta Potential: Many models, such as the Zeta-Pak®, utilize Micro-Media® containing wet strength resins that generate a positive electrokinetic charge (zeta potential). This attracts and holds negatively charged particles (like bacteria and haze colloids) smaller than the mechanical pore size.
• High Surface Area: The accordion-like structure of the cells packs a massive amount of surface area into a compact footprint, allowing for high flow rates.
• Scalability: Housings can accommodate 1, 2, 3, or 4 vertically stacked modules, allowing you to scale up filtration area without changing the footprint of your skid.
• Safety: The enclosed housing design creates a closed-loop system, preventing product exposure to the atmosphere—crucial for volatile solvents or sanitary applications.

Product Models and Applications

ErtelAlsop offers distinct product lines tailored to specific fluid characteristics. Choosing the correct media formulation is critical for process optimization.

Model	Media Composition	Primary Application
Zeta-Pak®	Cellulose, Diatomaceous Earth (DE) or Perlite, Resin	General purpose, botanical extracts, haze removal, chemicals.
Bio-Pak®	Pharmaceutical Grade Cellulose & Filter Aids	Critical pharma, biologics, vaccines, and blood fractionation.
Disc-Pak®	100% Cellulose (AlphaMedia)	Applications requiring no resins or inorganic aids; dielectric oils, syrups.
ZetaDri-Pak®	Moisture absorbing media	Removing trace water from transformer oils and industrial fluids.
MicroClear™	Impregnated Activated Carbon	Decolorization and odor removal without loose carbon powder.

Technical Specifications

When selecting a Pak Lenticular filter, understanding the configuration options is ensuring compatibility with your existing housing and process requirements.

General Specifications
Diameters Available	12 inch (1.8 m² area approx) 16 inch (3.6 m² area approx)
Micron Ratings	Nominal ratings from 0.25 µm to 15 µm
Number of Cells	Standard 16 cells (Custom counts from 5 to 18 available)
Core Material	Polypropylene (Standard) or Stainless Steel
Gasket Materials	EPDM, Viton, Buna-N, Silicone, Teflon Encapsulated
Max Operating Temp	Typically 180°F (82°C) *Dependent on gasket/media

End Cap Configurations: Flat Gasket vs. Double O-Ring

Compatibility with your filter housing is determined by the end cap style. ErtelAlsop Paks are available in two primary configurations:

Why Choose ErtelAlsop Paks?

ErtelAlsop invented the lenticular cartridge format. Their formulations include high-purity Diatomaceous Earth (DE) which creates a rigid, porous filter cake capable of sieving out particulate while maintaining flow. For botanical extraction specifically, dewaxing and lipid removal are significantly improved by the adsorption capabilities of the Micro-Media.

Common Use Cases:

• Winterization: Removal of waxes and lipids in ethanol extraction.
• Distilled Spirits: Polishing filtration to remove haze and cloudiness.
• Fragrances: Clarification of essential oils.
• Transformer Oils: Removal of carbon arc byproducts and water.