Advanced Depth Filtration with ErtelAlsop Pak® Lenticular Technology
In the world of high-purity liquid filtration, the ErtelAlsop Pak® Lenticular Filter stands out as a versatile and robust solution. Designed to combine the superior particle retention of depth filter media with the convenience of a closed, modular cartridge system, these filters are the workhorse for industries ranging from pharmaceuticals to botanical extraction.
At Purecowater, we understand that protecting your downstream equipment and ensuring product clarity is paramount. The ErtelAlsop Pak® series offers a scalable, leak-free solution that handles high solids loading more efficiently than traditional surface filters. Below, we break down the technical specifications, media options, and applications for this essential product.
What are Lenticular Filters?
Lenticular filters, often referred to as “modules” or “cartridges,” consist of individual filter cells stacked vertically. Each cell is comprised of two die-cut sheets of depth filter media sealed at the edges to an internal core and an outer ring. This design resembles a double convex lens (hence “lenticular”).
Unlike standard pleated cartridges that rely on surface filtration, the Pak® Lenticular cartridges utilize depth filtration. The media creates a complex tortuous path that traps particles throughout the thickness of the sheet, not just on the surface. This allows for:
- Higher Dirt Holding Capacity: Capable of retaining significantly more solids before plugging.
- Zeta Potential: Many media grades are formulated with a positive charge (zeta potential) to electrokinetically attract negatively charged contaminants like bacteria and fine hazes [store.clearsolutionscorp.com].
- Leak-Free Design: The sealed edge technology eliminates the bypass issues often associated with plate and frame filter presses.
Technical Specifications
The ErtelAlsop Pak® lines are engineered for compatibility with a wide range of housings and fluids. They feature polypropylene cores for chemical resistance and offer multiple gasket materials to suit aggressive solvents or sanitary requirements.
| Feature | Specification Details |
|---|---|
| Diameters | 12 inch (30.5 cm) & 16 inch (40.6 cm) |
| Micron Ratings | 0.25 µm – 15 µm (Nominal) |
| End Cap Configurations | Flat Gasket, Double O-Ring (Code 222 style fit) |
| Core Material | Polypropylene (Standard), Stainless Steel Straps (Optional) |
| Gasket Materials | EPDM, Viton, Buna-N, Silicone, Teflon Encapsulated |
| Construction | 16 cells standard (can range from 5 to 18) |
Media Formulations and Performance
One of the primary benefits of the ErtelAlsop line is the variety of media formulations available, allowing users to target specific contaminants, from lipids and waxes to color bodies and water hazes [ertelalsop.com].
1. Zeta-Pak® (Micro-Media®)
The industry standard for general and critical applications. These modules incorporate cellulose, high-purity Diatomaceous Earth (DE), and a wet strength resin. The integration of DE allows for a rigid, porous structure that provides excellent clarity. The resin imparts a positive Zeta Potential, enhancing the removal of ultrafine particles that are smaller than the nominal micron rating [clearsolutionscorp.com].
2. Disc-Pak® (AlphaMedia®)
Formulated from 100% cellulose without resins or inorganic filter aids. Ideal for applications where extractables are a major concern or where the specific chemical compatibility of cellulose is required. Commonly used in light to medium viscosity liquids like syrups and perfumes.
3. Bio-Pak® (Pharma Grade)
Specific for critical pharmaceutical and biotech applications. These units typically feature the double O-ring seal to ensure zero bypass and are supported by validation guides. They are used for plasma fractionation, culture media, and bulk filtration.
4. ZetaDri-Pak® (Water Removal)
A specialized module designed to absorb free and emulsified water from oils (such as transformer oil or botanical extracts). A 16-cell cartridge can hold up to 148 ounces of water, protecting downstream equipment from moisture damage.
Key Applications
The versatility of the Pak® Lenticular Filters makes them appropriate for several high-stakes industries.
🌱 Botanical Extraction & Hemp
Lenticular filters are the industry standard for winterization and dewaxing. The Micro-Media® formulation effectively removes coagulated waxes and lipids from ethanol extracts while maintaining high flow rates. The depth media captures soft, deformable particles that would typically blind a surface filter instantly.
🍷 Food & Beverage
From distilled spirits to wine and juices, these filters provide polish filtration to remove haze and particulate without stripping flavor or odor. The DE-impregnated media is safe for food contact (CFR 176.170).
⚡ Industrial & Utilities
Used for reconditioning insulating oils in transformers and circuit breakers. The AquaKv-Pak® series can simultaneously remove carbon particulates and dissolved water to restore dielectric strength.
Why Choose ErtelAlsop Pak®?
- Scalability: Easily scale up from lab-sized 12″ housings to multi-round 16″ process housings.
- Operator Safety: The enclosed housing reduces exposure to fluids and vapors compared to open plate and frame presses.
- Cost Efficiency: Reduced downtime due to high solids holding capacity and rapid changeout procedures (less than 15 minutes).
Whether you are dealing with difficult solid loads in botanical extracts or require ultra-clean effluents for pharmaceutical production, the ErtelAlsop Pak® Lenticular Filter is a proven solution.
Need help selecting the right heavy-duty filtration solution?
Our team at Purecowater specializes in solving complex solid and liquid filtration problems.