German standard methods for the analysis of water, waste water and sludge; Microbiological methods (group K); Detection of Pseudomonas aeruginosa (K8)— 10 стр.
German standard methods for the examination of water, waste water and sludge; Microbiological methods (Group K); Preparation for the microbiological examination of water samples (K1)— 7 стр.
Softeners (cation exchangers) for drinking water installation - Part 100: Requirements for application of softeners in accordance with DIN EN 14743— 13 стр.