High-Efficiency Depth Filtration for Industrial and Sanitary Applications
For industries requiring rigorous liquid clarification and particulate removal, ErtelAlsop Pak Lenticular Filters represent the gold standard in depth filtration technology. As a distributor for premier filtration solutions, Purecowater provides these advanced modules to address complex filtration challenges in pharmaceutical, food and beverage, chemical, and botanical extraction applications.
The ErtelAlsop Pak® configurations—often referred to as lenticular cartridges or modules—offer the superior retention capabilities of traditional plate and frame filter presses but are housed in a totally enclosed, sealed system. This design eliminates leakage, reduces oxidation, and significantly simplifies change-outs.
What is a Lenticular Filter?
A lenticular filter module consists of individual depth filter cells stacked vertically. Each cell is constructed from two discs of filter media sealed around the edges. This “double convex” lens shape gives the format its name. The modules come pre-compressed and ready to load into a housing, unlike filter sheets which must be manually placed and tightened in a press.
The core advantage of the ErtelAlsop Pak design is the use of Zeta-Pak® and Micro-Media® technology. These filters are impregnated with filter aids like Diatomaceous Earth (DE) or Perlite and modified with a wet-strength resin to create a positive Zeta potential. This electrokinetic charge attracts and holds negatively charged sub-micron particles—such as haze, bacteria, and colloids—that might otherwise pass through a mechanical sieve.
Key Features and Benefits
- Closed Loop System: The enclosed housing prevents exposure to the atmosphere, ideal for handling hazardous solvents, alcohol-based spirits, or critical pharmaceutical fluids.
- High Solids Loading: The depth media structure traps particles deep within the matrix, not just on the surface, allowing for longer service life before blinding.
- Scalability: Available in 12-inch and 16-inch diameters with varying cell counts (5 to 16 cells), allowing users to scale from pilot testing to full production easily.
- Zero Leakage: Edge-sealed modules ensure that no liquid bypasses the media, providing consistent filtrate quality.
Technical Specifications
ErtelAlsop cartridges are highly versatile, compatible with a wide range of housings and solvent types. Below are the standard specifications for the Zeta-Pak and Micro-Media series available through Purecowater.
| Feature | Specification Details |
|---|---|
| Diameters Available | 12 inch (30.5 cm) & 16 inch (40.6 cm) |
| Micron Ratings (Nominal) | 0.25 µm to 15 µm (Common: 1.0, 2.5, 5.0 µm) |
| Media Component | Cellulose, Diatomaceous Earth (DE), Wet Strength Resin |
| End Cap Configurations | Flat Gasket or Double O-Ring (222/226 styles) |
| Gasket Materials | EPDM, Silicone, Viton, Buna-N |
| Core Material | Polypropylene (Standard), Stainless Steel (Optional) |
| Max Operating Temp | Typically up to 180°F (82°C) dependent on gasket |
Primary Applications
The versatility of the ErtelAlsop Pak makes it a “workhorse” across several major industries. Because the media contains Diatomaceous Earth, it acts as a rigid, porous cake that sieves out particulate matter without affecting the odor or taste of the liquid.
1. Botanical Extracts & Hemp Processing
Lenticular filters are essential for winterization and dewaxing. The large surface area allows for high flow rates of ethanol or hydrocarbon solvents, while the DE media efficiently removes waxes, lipids, and chlorophyll. The closed housing prevents solvent evaporation and increases safety.
2. Distilled Spirits and Beverages
For haze removal in whiskey, vodka, and cognac, the Zeta-Pak modules remove fatty acids and fusel oils that cause cloudiness at lower temperatures. They polish the spirit to a high shine without stripping essential flavor profiles.
3. Pharmaceuticals and Cosmetics
Used for the filtration of syrups, perfumes, and active pharmaceutical ingredients (APIs). The depth filter structure efficiently retains gels and colloids that would rapidly clog surface filters like membranes.
Why Choose ErtelAlsop Modules?
ErtelAlsop invented the lenticular format (originally Alsop Engineering) and continues to lead the market with high-purity manufacturing standards. Their Micro-Media® series is 21 CFR 176.170 listed, making it generally recognized as safe for food contact.
By utilizing a Pak filter system, operators can reduce downtime associated with cleaning plate and frame presses. A spent module can be removed and replaced in minutes, keeping your production line moving efficiently.
Whether you are filtering fine chemicals, spirits, or botanical oils, selecting the right micron rating and media formulation is critical to maximizing yield and quality.