[Microbial settlement of paint- and building-materials in the sphere of drinking water. 3. Macrocolonies on the joint in a drinking-water-reservoir covered with tile (author's transl)].

The microbial growth in form of macrocolonies on the joint of a drinking-water-reservoir covered with tile could be observed repeatedly. The slime was examined microbiologically. The origin of the carbon sources was determined by radiocarbon test.