Production
Below are links to PDF documents that will be useful when setting up to produce filters. You can also learn a lot by visiting the informative website of Filtron, a well-established filter factory in Jinotepe, Nicaragua.
English
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Investigation of the Potters for Peace Colloidal Silver Impregnated Ceramic Filter, December 2001: extensive review of filter effectiveness (80 pages)
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Best Practice Recommendations for Local Manufacturing of Ceramic Pot Filters for Household Water Treatment, June 2011: extensive review of all aspects of production (186 pages)
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Clay Testing Protocols, detailed and illustrated instructions for making clay test bars, firing them, and testing them for plasticity, shrinkage, water absorption and durability (8 pages)
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Building the Mani Kiln: detailed and illustrated instructions for building a kiln to fire ceramic water filters (20 pages)
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Mani Kiln: airflow, dimensions, firing technique, problem solving, safety (17 pages)
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Plans for a Filter Press: This PWB Scissor Press, used in filter making, was developed by Potters Without Borders (www.potterswithoutborders.com).
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Video on how to make a Filter Press (youtube)