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[Microbial colonization of coating and building materials in contact with drinking water. 11. Long-term studies of a drinking water reservoir with polyester isolation].

Building materials of drinking water reservoirs can support a microbial growth as shown in former communications. A new case is presented, where the microorganisms used the polyester isolation as carbon source. The isolation was installed between two concrete layers of a drinking water reservoir. The organic substances were identified by chemical analyses.