Filtralite filter media are used for a number of water treatment applications; such as drinking water treatment, wastewater treatment and on-site treatment of effluent water.

Water is a necessity for all life

Drinking water is our most important resouce and water quality requirements are, and should be, very strict. 

To achieve good quality drinking water, different types of treatments are used based on the quality of the the raw water. For many treatment processes Filtralite is an excellent filter media.

Research and Development

The development of Filtralite filter media is carried out in close cooperation with universities and research institutes both in Norway and worldwide. A doctoral thesis on drinking water filtration using Filtralite is completed. Many reports and papers have been written on various aspects of the use of Filtralite for drinking water treatment. Saint-Gobain operates a sophisticated laboratory for filter media testing, and cooperates with both Norwegian and international research laboratories.

Pilot plants

Running a pilot plant is usually the best way of achieving information on the performance of a specific process or a material used for water treatment.


Filtralite filter media is made by the burning of clay at about 1200º C, followed by crushing and sieving of the resulting expanded, clay pellets. The material has a very porous structure, and crushing exposes a large surface area. Dry particle densities are in the range 500-1,600 kg/m³, and the aggregate size range is 0-20 mm. Filtralite materials are flexible and can be "tailor-made" for specific applications. The aggregates do not release any harmful substances and the acid solubility is minimal. Despite its low density and high porosity, Filtralite has high abrasion and impact resistance.


Three main types of Filtralite are available, with three different densities. For drinking water applications crushed material is used. The crushing have produced angular grains and allows full exposure of the porous core to the water.