Since you are talking about Water Issues. Me and my friend during our research project, as far i know this research is never done on any level.
First we made a simple Double water filtration system (Which wasn't costly at all). We applied concept of absorption on our process. For this we used materials like Sand, Silica, Egg covers, and charcoal.
As far i have searched, filtration is done billion times, but almost all people used a single process to do this.
But with our method, in a single go you can eliminate every type of stuff from poor quality water. You can remove all bacteria, viruses, smell, taste issues, hard metals dissolved, soft metals dissolved, e.t.c e.t.c
At the end of our process, we compared our filtered water properties with WHO (World Health Organization) standards and they were pretty accurate.
Further our University forwarded our whole research project (Because our work was different from other students) to HEC because they were looking for new research projects. So far according to their response, they have accepted our project and they are trying to further modernize it and will make it more effective, and then they will give us final verdict.
We believe if some company apply our idea on a massive level, sure it will be very helpful in those areas of Pakistan where there is massive shortage of water, and also it is not much expensive.
