The most commonly used filter materials are sand and anthracite.

At least one of the central, upper and lower portions is formed from filter media.

Natural filter material can also be used, e.g. as a soil improver.

simplification of storage - only one sewing thread for all high-performance filter media

The temperature sensitive powder can encapsulate the additive materials and other portions of the smoking articles, such as sorbents or filter materials, in order to reduce additive material migration during storage.

The invention relates to ceramics, more specifically porous silicon carbide ceramics, which can, for example, be used as filter materials, and to a method for the production thereof.

A respirator having this construction is more resistant to inward collapse of the filter media during breathing and is more aesthetically pleasing.

The method may be used to recover biological particles, such as leucocytes and blood platelets, from filter materials on which they are retained by adsorption.

This results in a mixture of solvent and filter cloths impregnated with dirt, in particular kieselguhr, from which the solvent must then be recovered.

The invention also concerns filter media comprising treating a solid substrate with an aqueous solution of a pre-hydrolyzed positively charged multivalent metallic species and an additional biocide..

The replacement and regeneration of exhausted media are important economic considerations in achieving the contaminant treatment goal.

The filter system may include a filter material capable of capturing hydrogen sulfide (H2S) from a fluid, where the filter material is disposed between a first and second filter media.

A wastewater treatment system includes a septic tank having a discharge in flow communication with one or more biofilter containers having filter media therein.

The invention relates to the use of an aqueous polymer dispersion containing methacrylic acid and N-methylol-acrylamide as a binding agent for the production of filter materials and for base paper for decorative foils.

After chemical, enzymatic or thermal treatment, natural filter material (e.g. diatomaceous earth) may be partially reused in the filtration process.

Other uses include pipes, filter material and plastic products that require a higher quality than its predecessor polyethylene can offer.