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* Ulrich, A. (Ed.), Reuter, S. (Ed.), Gutterer, B. (Ed.), Sasse, L., Panzerbieter, T. and Reckerzügel, T. (2009). [https://wedc-knowledge.lboro.ac.uk/resources/books/DEWATS_-_Chapter_01.pdf Decentralised Wastewater Treatment Systems (DEWATS) and Sanitation in Developing Countries. A Practical Guide]. WEDC, Loughborough University, Leicestershire, UK.
* U.S. EPA (2000). [https://www3.epa.gov/npdes/pubs/trickling_filt_nitrification.pdf Wastewater Technology Fact Sheet. Trickling Filters]. 832-F-00-014. U.S. Environmental Protection Agency, Washington, D.C., US.:Available at: (Design summary including tips for trouble shooting)
===Acknowledgements===
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