Searches on Google Scholar find a number of articles - since there is another page about the water filters themselves, this article should focus on papers like the top two on this list, which are specifically about the organisation and its social activist work.
Rarick, Charles A. and Duchatelet, Martine, Potters for Peace: Building Social Entrepreneurs One Piece at a Time (2006). Journal of the International Academy of Case Studies, 4(1)2006, Available at SSRN: https://ssrn.com/abstract=2491964
Carpenter, B. S. (2010). Embodied Social Justice: Water Filter Workshops as Public Pedagogy. In Handbook of Public Pedagogy: Education and Learning beyond Schooling (pp. 337-340). Taylor and Francis. https://doi.org/10.4324/9780203863688-52
Kowalski, K. (2008). Removal of virus-sized particles and escherichia coli by the potters for peace ceramic water filter (Order No. 1460862). Available from ProQuest One Academic. (288219160). Retrieved from https://www.proquest.com/dissertations-theses/removal-virus-sized-particles-escherichia-coli/docview/288219160/se-2