[Determination of material-dependent germ multiplication in the stand test].

Materials used in drinking water may lead to an increase of microorganisms. Microbiological examinations of material in jar tests have been repeatedly dealt with in literature. However they yielded contradictory results. Within the scope of these examinations it was to be found out if and under which conditions an experimental examination of materials, the criterion of test being microbial growth in water, is possible. For the examinations in jar tests it is necessary to have a minimal concentration of mineral salt in the water and to use germs which can degrade the components issued by the materials.