Advanced Depth Filtration with ErtelAlsop Pak® Lenticular Tech
For industrial applications requiring precision solid-liquid separation, Purecowater provides the full line of ErtelAlsop Pak® Lenticular Filters. As a distributor handling complex filtration challenges, we supply these depth filter modules to industries ranging from pharmaceuticals and cosmetics to food and beverage processing.
The Pak® Lenticular Filter is designed to combine the advantages of depth filter sheets with the convenience of a closed, modular cartridge system. By stacking filter cells into a lenticular formation, facilities can achieve high flow rates, superior particle retention, and easier change-out procedures compared to traditional plate and frame filter presses.
How Lenticular Technology Works
Lenticular cartridges, often referred to as modules, are constructed from varying numbers of stacked filter cells (typically 5 to 18 cells per unit). Each cell consists of a pair of depth filter media sheets (such as Micro-Media® or AlphaMedia®) sealed around the edges. This design resembles a stack of double convex lenses.
The core advantage lies in the Zeta Potential. Many of these modules, specifically the Zeta-Pak®, are formulated with wet strength resins that modify the media to exhibit a net positive charge. This electrokinetic adsorption allows the filter to attract and hold negatively charged particles (like bacteria and endotoxins) that are smaller than the physical pore size of the media.
Product Series Breakdown
ErtelAlsop offers distinct formulations to match specific chemical compatibility and filtration goals. Below is a comparison of the primary modules available through Purecowater.
| Module Series | Media Composition | Primary Application | Key Feature |
|---|---|---|---|
| Zeta-Pak® | Cellulose, Diatomaceous Earth (DE), Resin | Chemicals, Pharma, Botanical Extracts | High Zeta Potential for sub-micron retention. |
| Disc-Pak® | 100% Cellulose (AlphaMedia®) | Dielectric oils, Syrups, Fragrances | No inorganic additives (DE/Perlite). Ideal for sensitive ingredients. |
| Bio-Pak® | Pharmaceutical Grade Media | Biologicals, Plasma Fractionation | Double O-ring seal to prevent bypass in critical zones. |
| ZetaDri-Pak® | Water Absorptive Media | Transformer Oils, Silicones | Removes free and emulsified water + particulates. |
Technical Specifications
For engineers and plant managers planning integration, the physical and operational specifications of the Pak® modules ensure compatibility with most standard lenticular housings.
- Diameters Available: 12 inch (30.5 cm) and 16 inch (40.6 cm)
- Core Material: Polypropylene (Standard) or Stainless Steel straps
- End Cap Configurations: Flat Gasket or Double O-Ring
- Gasket Materials: EPDM, Viton, Buna-N, Silicone, Teflon Encapsulated
- Micron Ratings: Nominal retention ranges from 0.25 µm to 15 µm
- Cell Count: Customizable from 5 to 18 cells per stack to adjust surface area
Common Applications
Botanical Extract & Oil Processing
In the production of botanical extracts, Zeta-Pak® filters are extensively used for winterization and dewaxing. The Diatomaceous Earth (DE) integrated into the media creates a rigid, porous structure that effectively sieves out waxes and lipids without stripping the desired active compounds or altering flavor profiles.
Pharmaceuticals & Biotechnology
Bio-Pak® modules are critical for downstream processing. Their net positive charge is vital for removing endotoxins and ultrafine particles from culture media and intermediates. The availability of Low Beta-Glucan (L-Series) media helps prevent false positives in LAL endotoxin testing.
Distilled Spirits & Fragrances
For applications where mineral extractables must be minimized, the Disc-Pak® provides intense clarity using 100% cellulose. This is ideal for adjusting the haze in spirits or filtering perfumes where Diatomaceous Earth might adsorb essential notes.
Why Choose Modular Depth Filtration?
Switching from plate and frame presses to Pak® Lenticular modules offers distinct operational benefits:
- Reduced Loss: Enclosed housings minimize drip loss and exposure to the atmosphere.
- Operator Safety: Hazardous fluids are contained within the housing/module assembly.
- Rapid Change-out: Modules can be loaded and unloaded significantly faster than restacking a filter press.
At Purecowater, we help you select the exact media grade and gasket configuration to match your solvent, pH, and temperature requirements.
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