Introduction to ErtelAlsop Pak® Lenticular Filters
In the world of industrial liquid filtration, ErtelAlsop Pak® Lenticular Filters stand out as a versatile and robust solution for depth filtration. Originally developed by ErtelAlsop, this technology bridges the gap between traditional plate and frame filters and modern cartridge filtration. It offers the high solids-loading capacity of depth media with the convenience of an enclosed, easy-to-change cartridge system.
At Purecowater, we distribute premier filtration technologies to solve complex liquid processing challenges. This guide details the specifications, media options, and applications of ErtelAlsop’s Lenticular Pak® Cartridges to help you determine the best fit for your process.
What is a Lenticular Filter?
A lenticular filter module consists of stacked, disc-shaped filter cells. Each cell is comprised of two sheets of depth filter media sealed at the edges to an inner core. This stacked design resembles a convex lens, hence the name “lenticular.”
Key Advantages Over Plate & Frame Filters
- Enclosed System: The modules fit inside a sealed housing, preventing leakage and reducing exposure to the product.
- Rapid Changeout: Unlike the labor-intensive process of restacking a plate and frame press, lenticular modules can be swapped out in minutes.
- Scalability: Available in 12-inch and 16-inch diameters with varying cell counts (5 to 18 cells) to match flow rate and surface area requirements.
Media Formulations and Options
ErtelAlsop Pak® cartridges are available with various media compositions to suit specific chemical compatibility and filtration goals.
| Media Series | Composition | Primary Application |
|---|---|---|
| MicroMedia® (Zeta-Pak®) | Cellulose, Diatomaceous Earth (DE) or Perlite, Wet Strength Resin | General clarification, haze removal, bio-burden reduction. Features positive Zeta potential to attract negatively charged particles. |
| AlphaMedia® (Disc-Pak®) | 100% Cellulose (No inorganic filter aids) | Applications requiring low extractables, such as dielectric oils, organic solvents, or where DE is prohibited. |
| MicroClear® | Cellulose immobilized with Activated Carbon | Decolorization, odor removal, and removal of trace organic contaminants without handling loose carbon dust. |
Technical Specifications
Understanding the technical parameters is essential for sizing the correct housing and estimating throughput. Below are the standard specifications for the Pak® Lenticular series.
| Micron Ratings | 0.25 µm to 15 µm (Nominal) |
| Module Diameters | 12 inch (30.5 cm) & 16 inch (40.6 cm) |
| Cell Counts | High Capacity (up to 18 cells) and Low Capacity options available |
| Core Material | Polypropylene |
| End Cap Configurations | Flat Gasket (DOE) or Double O-Ring (Plug-in) |
| Gasket Materials | EPDM, Buna-N, Silicone, Viton®, Teflon® Encapsulated |
| Maximum Operating Temp | Approx. 180°F (82°C) (Dependent on gasket/media selection) |
Common Applications
The flexibility of the ErtelAlsop Pak® design makes it suitable for a wide array of industries. The tortuous path created by the depth media ensures high retention efficiency for deformable particles and hazes.
1. Food & Beverage
Used extensively for the polishing of distilled spirits, wines, beers, and syrups. The MicroMedia® series is particularly effective at removing haze-causing proteins and yeast without stripping flavor profiles.
2. Pharmaceuticals & Bio-Processing
Ideal for API filtration, blood fractionation, and cell broth clarification. The lenticular format allows for scalable trials from lab (4-inch caps) to production (16-inch stacks).
3. Botanical Extracts
A preferred choice for dewaxing and lipid removal in hemp and cannabis extraction. The filter aid embedded in the media acts as a secondary trap for waxes that precipitate during winterization.
4. Chemicals & Cosmetics
Utilized for the clarification of perfumes, essential oils, and silicones. The AlphaMedia® (all-cellulose) option is crucial here for maintaining purity without introducing mineral extractables.
Why Choose ErtelAlsop?
With over 80 years of innovation, ErtelAlsop is the original inventor of the lenticular cartridge format. Their commitment to quality ensures consistent lot-to-lot performance, which is critical for validated processes. Whether you are dealing with high solid loads or require fine sub-micron retention, the Pak® series offers a reliable solution.
Need help sizing a housing or selecting the right media grade?
Filtration involves balancing flow rate, throughput, and retention. Our team at Purecowater can help you analyze your process parameters to select the optimal ErtelAlsop configuration.
Contact Purecowater
Optimize your filtration process today with premium depth filter modules from ErtelAlsop. Validating the correct micron rating and media type can significantly reduce downtime and improve product quality.