Filter Aids

FILTER AIDS are fine, chemically inert powders used in both process and waste liquid  filtration to maintain high flow-rates while giving brilliant clarity. For difficult separations, this long-established technology is the economical way to produce high quality fluids and manageable solid residues.

GENERAL FILTRATION covers all the applications with three types of FILTER AID and over 60 grades, most of which we stock for immediate shipment.We have represented DICALITE since 1955 and possess a wealth of FILTER AID experience.

See Filter Aids in Library for related information.


Diatomaceous earth (D.E.) is an amorphous form of silica containing a small amount of microcrystalline material. Filter aids are processed at above 800 °C (1500 °F). Both calcined and flux-calcined diatomite filter aids are free of organic matter and are non-adsorptive.

filter aids provide outstanding performance from the finest to the coarsest grades. These materials meet all requirements for good filter aids. They meet the exacting clarity and flow-rate demands of industrial filtration. Even more important, the user can depend on consistency and uniformity load after load.
We stock DICALITE DIATOMITE grades manufactured from both freshwater and marine deposits of diatomaceous earth (D.E.). With our experience, we can determine the correct product and the right grade for your application to produce optimal flow and clarity at the right price.

Download DICALITE diatomaceous earth Kosher Certificate


PERLITE in nature is a dense glassy rock formed by volcanic action, an amorphous mineral consisting of fused sodium potassium aluminum silicate. When crushed and processed at temperatures exceeding 800°C (1500°F) which eliminates organic matter, it pops like popcorn, expanding to 20 or more times its original volume. A special milling and classification process gives DICALITE PERLITE filter aids the structure and correct particle size range distribution needed for optimum performance.

Solubility in mineral and organic acids is extremely low at both low and high temperatures. Solubility in strong alkalis will vary according to temperature and time of contact. DICALITE PERLITE filter aids do not impart taste or odor to liquids being filtered.

A major advantage of DICALITE PERLITE filter aids is less weight per unit volume than standard diatomite filter aids. Pound for pound, perlite yields up to 20% greater filtering capacity resulting in comparable savings in filter aid usage, especially on rotary vacuum precoat filters.

Low density, low crystalline-silica DICALITE PERLITE suits a wide range of process and wastewater applications.


SOLKA-FLOC® is a fibrous cellulose filter aid derived from highly purified wood pulp. Where silica solubility with diatomaceous earth (D.E.) and with perlite is an issue, SOLKA-FLOC® is the viable alternative. Applied as a precoat on damaged or worn filter screens, it eliminates particle bleedthrough. SOLKA-FLOC® is used in applications where the filter cake must be incinerated to recover residual metal values, something not possible with diatomaceous earth or perlite.