Hi Chioma, I inluded an extended response above, thank you very much for the question. The most simple device could be a large plastic fresnel lens mounted above the slurry tray that is in the focal plane of the lens. The user can move the slurry tray in 2 dimensions effectively fusing the surface (and baking/sanitizing the bulk if needed) of the slurry point by point creating a filter cartridge disk. I hope it helps, please let me know if you have questions.
Hi Chioma, I think East-Africa test would be easiest for us just because of our experience. Depending on the support we receive, we are of course open to a broad range of ideas in test sites. There is a wide range of filters in use depending on the situation. For practical reasons, solar sintering is easier and faster in planar geometries and the required equipment is therefore simpler - in my experience keeping it extremely low cost and simple is key for our target application. Solar sintering is also the easiest to execute as a surface or thin layer treatment process that opens up possibilities such as unsintered but enclosed granular cores and gradual change of pore size between the bottom and top of filter. We only established the feasibility of the process and we will need help with in-situ testing of prototypes that we plan to build in the lab.