It is left in natural condition, crushed and sieved material originating from hard coal of extremely high hardness and abrasion resistance. Natural anthracite is, to a large extent, chemically neutral.
The grain's characteristics can be described in the following way:
HYDRO–ANTHRACITE N is used in all common filtering applications. Anthracites of hard coal show no specific properties because of their neutral nature.
This material is obtained from brown coal, which has undergone a thermal treatment. As compared to HYDRO–ANTHRACITE N it is softer and slightly less resistant to abrasion.
The grain's characteristics can be described in the following way:
HYDRO–ANTHRACITE H is used in all common filtering applications. Through initial processing the material obtains adsorption properties that can be estimated at ca. 25% of the activity of activated carbon.
As a result, the material removes ozone and reduces the level of chlorine compounds, and even removes THM. Therefore, the use of HYDRO–ANTHRACITE H for water treatment in swimming pools is prefered.
The porous and cracked structure of the grain provides good conditions for the creation of "a biological diaphragm". This explains the particular usefulness of the porous material in biological and catalytical filtration processes, such as: sewage filtration and treatment, removal of iron and manganese.
This material is a special type of coal subjected to thermal treatment.
The grain's characteristics can be described in the following way:
Because of its high porosity, the material is suitable for ozone removal.
HYDRO–ANTHRACITE P is characterized by the highest degree of cleanliness among all multilayer filter beds materials and is chemically neutral also in high temperatures. This material does not release silicone acid and therefore it is suitable for condensate filtration.
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