At Purecowater, we specialize in solving complex liquid filtration challenges. Among our premier depth filtration offerings are the ErtelAlsop Pak® Lenticular Filters. Designed to provide superior particle retention and high solids loading capacity, these filters are the modern evolution of depth filtration technology.
This guide explores the specifications, benefits, and applications of the ErtelAlsop Pak series, specifically the Zeta-Pak® and Disc-Pak® modules, to help you determine the best solution for your process.
What is a Lenticular Filter?
The lenticular filter module (often called a “cake” or “disc” stack) was originally invented by Alsop Engineering. It combines the proven technology of depth filter sheets with an enclosed, user-friendly cartridge format. Inside a lenticular housing, these stacked discs function similarly to a plate and frame filter press but without the leakage, open-air exposure, and labor-intensive change-outs.
ErtelAlsop Pak Lenticular Filters are the industry standard for applications requiring the removal of ultra-fine particles, haze, and biological contaminants from liquids.
Product Variations: Zeta-Pak® vs. Disc-Pak®
Depending on your fluid characteristics and purity requirements, ErtelAlsop offers distinct media formulations:
1. Zeta-Pak® Lenticular Cartridges
The Zeta-Pak® is the workhorse of the ErtelAlsop line. These modules are constructed using Micro-Media®, which incorporates high-purity Diatomaceous Earth (DE) or Perlite filter aids embedded in a cellulose matrix.
- Mechanism: Combines mechanical screening with electrokinetic adsorption (zeta potential) to attract negatively charged contaminants.
- Best For: Difficult-to-filter liquids with haze or fine particulate that require high retention efficiency.
- Key Feature: Pre-impregnated media eliminates the need for loose filter aids, keeping the process clean.
2. Disc-Pak® Lenticular Cartridges
The Disc-Pak® utilizes AlphaMedia®, which is composed of 100% cellulose without inorganic filter aids (like DE or Perlite).
- Mechanism: Pure mechanical depth filtration.
- Best For: Applications sensitive to ionic extractables or where silica/inorganic ash is prohibited, such as certain pharmaceutical, cosmetic, or dielectric oil applications.
- Key Feature: Extremely low extractables and high chemical compatibility.
Technical Specifications
ErtelAlsop modules are designed to fit standard industry housings, offering flexibility in configuration and micron ratings.
| Specification | Details |
|---|---|
| Diameter Options | 12-inch and 16-inch |
| Number of Cells | Standard 16 cells (custom configurations from 5 to 18 cells available) |
| Micron Ratings | Nominal ratings ranging from 0.25 µm to 20 µm+ |
| End Cap Configurations | Flat Gasket or Double O-Ring (222/226 style equivalent) |
| Core Material | Polypropylene (Standard), stainless steel options for high-temp |
| Gasket Material | EPDM (Standard), silicone, Viton, and others available |
| Sterilization | Steam-in-place (SIP) capable |
Why Switch from Plate & Frame to Lenticular?
Many facilities are upgrading from traditional plate and frame presses to lenticular Pak® modules for several operational reasons:
- Zero Leakage: The totally enclosed housing prevents product loss and maintains a clean production floor.
- Reduced Labor: Changing out a lenticular module takes a fraction of the time required to redress a plate and frame press.
- Scalability: The chemistry of the media is identical to ErtelAlsop’s lab filters and filter sheets, allowing for seamless scale-up from R&D to full production.
Common Applications
The distinct grades of media available make these filters versatile across multiple sectors.
| Industry | Typical Applications |
|---|---|
| Pharmaceuticals | API purification, blood plasma fractionation, cell culture media, and LVP (Large Volume Parenterals). |
| Food & Beverage | Haze removal in distilled spirits, sugar syrup polishing, soft drinks, and flavor extract clarification. |
| Botanical Extracts | Wax and lipid removal (winterization) using Zeta-Pak® for high flow and surface area. |
| Chemicals | Filtration of inks, resins, varnishes, and solvents. |
| Cosmetics | Clarification of essential oils, fragrances, and lotions (often utilizing Disc-Pak® cellulose media). |
| Energy/Utility | Dielectric oil filtration and transformer oil reconditioning. |
Need Help Selecting the Right Filter?
Choosing between Zeta-Pak and Disc-Pak, or determining the correct micron rating for your stream, determines the success of your filtration process. Purecowater provides expert guidance and supply chain support for all ErtelAlsop products.
For inventory inquiries, technical sizing, or to place an order, please visit our contact page.