1. The removal of manganese, iron and ammonium nitrogen on impregnated activated carbon
2. D. Weil, K.E. Quentin, Bildung und Wirkungsweise der Chloramine bei der Trinkwasseraufbereitung. [Formation and mode of action of chloramines in drinking-water treatment.] 1. Teil (parts 1 and 2). Zeitschrift für Wasser und Abwasser Forschung, (1975) 8:5–16; 46–56 cited in WHO 1996.
3. WHO, Ammonia in drinking water: In Guidelines for drinking-water quality, vol. 2, second edition, Health criteria and other supporting information. World Health Organization, Geneva, 1996. Available from: http://www.who.int/water_sanitation_health/dwq/ammonia.pdf.
4. H.H. Dieter, R. Moller, Ammonium. In: K. Aurand et al. (Eds.), Die Trinkwasser verordnung, Einführung und Erläuterungen. [The Drinking-Water Regulations, Introduction and Explanations], Erich-Schmidt Verlag, Berlin, pp. 362–368, (1991) cited in WHO 1996.
5. Ammonia, iron and manganese removal from potable water using trickling filters