en-GB Filter media for variable filtration

Filter material

Filter material

A wide variety of filter materials are used in pressure filtration in households and industry. This starts with simple supporting gravel, filter sand and special filter materials such as Birm® and MTM® up to activated carbon. These materials are used, among other things, to remove iron, manganese, suspended solids and other substances from the water. The selection is made according to the requirements.

Filtration takes place in two steps. The first step is a simple screening of suspended material depending on the particle size. In addition, small particles that are not subject to this screening effect are also removed.

The first step in water treatment involves the removal of coarse impurities. Neutral filter media such as gravel or sand and our special filter materials such as Birm, MTM, activated carbon, hydroanthracite and pyrolox are used here.


For the use of:


Filter materials

Normally, the filter materials have a grain size of 300-700 μm and the space between the particles is 25-500 μm. The ability to filter out grain sizes that are smaller than the "screening gap" depends on various influencing variables such as gravity separation, particle diffusion, hydrodynamics, particle absorption, etc. These variables are influenced by physical properties such as the filter size, filtration rate, temperature, filter material density, size and shape of the suspended particles, etc. Not to be forgotten are influencing variables such as electrostatic pulsating forces and the Van der Waals forces, in which electrons dipolarly react to subatomic particle movements. Then there are also the properties of the filter materials, including oxidative, reductive or neutralizing type.
All filter materials require a backwash to remove the filtered substances, some require regeneration agents and many have limitations and conditions of use with regard to the water constituents. As a consequence of the complex filtration processes, data on filtration rates are often only assumptions. The filter rates must be related to the adsorption criteria. Filter materials as well as the water constituents can show a small, medium or high surface area, which considerably influences the absorption properties for absorption and separation.

If the filtration rates are too high, a poor filtration effect can be expected.
The backwash raises the filter bed and depends on the density of the material.

Too low backwash speeds prevent a good cleaning of the filter bed and result in poor filtration during operation. Excessively high filter rates can lead to loss / flushing of the filter material.

Activated carbon
Filter media
Hardening / deacidification

Filter materials

Inaqua Ravasol activated carbon

Ravasol activated carbon is used in several applications in water treatment. If its taste or smell removal or just for removing chlorine.
Ravasol activated carbon is offered as granular or powder. The basic substance is mainly mineral coal, coconut shells or wood.

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Inaqua Ravasol activated carbon


The Ravasol IRON-X is a reliable adsorbent based on Ferric Hydroxide for the removal of Arsenic (III + V) and heavy metals.  The media does not release any substances into the water.

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