For industrial and pharmaceutical applications requiring high solids loading capacity and leak-free performance, ErtelAlsop Pak® Lenticular Filters provide a superior solution. As a distributor for premier filtration technologies, Purecowater offers these depth detector modules to replace traditional plate and frame systems with a user-friendly, enclosed cartridge format.
This guide explores the specifications, various configurations (Zeta-Pak®, Bio-Pak®, ZetaDri-Pak®), and operational benefits of the ErtelAlsop Pak® product line.
What is a Lenticular Filter?
The Pak® Lenticular Cartridge (or module) is a stacked depth filter designed to combine the filtration quality of depth media sheets with the convenience of a cartridge. Each module consists of stacked filter cells—typically ranging from 5 to 18 cells per unit. Each cell is formed by a pair of Filter Media sheets (such as MicroMedia® or AlphaMedia®) sealed at the edges.
This design resembles a stack of double convex lenses (“lenticular”) and offers a fully enclosed system preventing fluid loss and protecting operators from exposure to the process fluid. It is an ideal upgrade for facilities looking to move away from open plate and frame presses while maintaining the same depth filtration mechanisms.
Key Features and Benefits
- High Solids Loading: The complex matrix of fibers and filter aids (like Diatomaceous Earth or Perlite) creates a structure that holds a high concentration of particles, surpassing surface filtration methods [ertelalsop.com].
- Scalability: Available in 12-inch and 16-inch diameters with over 300 precision dies to fit virtually any housing.
- Zero Leakage: Options like the Bio-Pak® feature Double O-Ring seals for critical pharmaceutical applications where bypass is not an option.
- Versatile Media: Formulations include 100% cellulose, DE-impregnated, and carbon-impregnated media to target specific contaminants like haze, water, or odor.
Product Configurations: The Pak® Family
ErtelAlsop offers distinct Pak® series designed for specific industrial needs. Below is a comparison of the primary models available through Purecowater.
| Product Series | Primary Application | Media Type |
|---|---|---|
| Zeta-Pak® | General Purpose & Industrial | MicroMedia® (Cellulose, Resin, Filter Aid) |
| Bio-Pak® | Pharmaceutical & Biotech | Pharma-grade media with Double O-Ring seal |
| ZetaDri-Pak® | Water Removal from Oils | Water adsorbent media |
| Disc-Pak® | Dielectric Oils, Syrups, Coolants | 100% Cellulose (AlphaMedia®) |
| AquaKv-Pak® | Transformer & Lube Oil Reconditioning | Media specialized for water retention & sub-micron particles |
Spotlight: ZetaDri-Pak® for Moisture Removal
For industries dealing with insulating oils or oil-based food products, water contamination is a major issue. The ZetaDri-Pak® is engineered to capture both free and emulsified water. A single 16-cell cartridge can hold a minimum of 148 ounces of water, effectively eliminating water-induced hazes [ertelalsop.com].
Technical Specifications
When selecting a lenticular module, compatibility with your existing housing and process fluid is critical.
| Micron Ratings | 0.25 µm to 15 µm (Nominal) |
| Diameters Available | 12-inch (30.5 cm) & 16-inch (40.6 cm) |
| Filter Area per Pak | Up to 3.42 m² (36 ft²) dependent on cell count |
| End Cap Configurations | Flat Gasket, Double O-Ring |
| Gasket Materials | Buna-N, Viton, EPDM, Silicone, Teflon Encapsulated, Neoprene |
| Core Material | Polypropylene or Stainless Steel |
Applications
Pharmaceutical & Biotech
The Bio-Pak® series meets the stringent requirements of the pharmaceutical industry. Used for cell harvesting, clarification of vaccines, and plasma fractionation, these filters ensure high product capability and come with validation guides. The Double O-Ring seal prevents bypass, ensuring sterility and consistency.
Food & Beverage
From syrup clarification to beverage hazing removal, the Zeta-Pak® utilizes MicroMedia® to polish fluids efficiently. The depth format is excellent for retaining gels and colloids that blind standard pleated surface filters.
Utility & Power Generation
The AquaKv-Pak® and ZetaDri-Pak® are essential for reconditioning transformer oils and circuit breaker oils. They restore dielectric properties by removing carbon fines and dissolved moisture, meeting ASTM standards [ertelalsop.com].
Integration with Filter Housings
One of the primary advantages of the Pak® system is the housing design. ErtelAlsop lenticular housings are available in both vertical and horizontal orientations. The unique “Lock and Load” horizontal design allows a single operator to load cartridges without overhead hoists, significantly reducing downtime [ertelalsop.com].
Existing plate and frame processes can be easily translated to this format; for example, one 4-high housing can hold up to 13.7 m² of filter area, providing massive throughput in a small, leak-proof footprint.
For more information on sizing, media selection, or to request a quote for ErtelAlsop Pak® filters, please contact our engineering team.