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Please see this thread on the SuSanA platform:
https://forum.susana.org/forum/categories/106-user-interface-technology-innovations/10144-sanitation-product-development-for-sub-saharan-africa-affordable-aspirational-latrine-products-sato-american-standard-brands-usa-and-water-for-people
Where some of the questions you asked are already answered and the original designers of the SaTo pan show up from from time to time.
Please see this thread on the SuSanA platform:
https://forum.susana.org/forum/categories/106-user-interface-technology-innovations/10144-sanitation-product-development-for-sub-saharan-africa-affordable-aspirational-latrine-products-sato-american-standard-brands-usa-and-water-for-people
Where some of the questions you asked are already answered and the original designers of the SaTo pan show up from from time to time.
Also see the official blog: https://blog.americanstandard-us.com/2015/04/15/improved-sanitation-devices-bring-better-hygiene-to-sub-saharan-africa/