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Thank you Christopher for your support.Alone we can do so little; together we can do so much.

Hello Giok,Coffee grounds are waste or leftover after the coffee is brewed which is usually thrown away

As of now I collect coffee as per the need from 3 coffee shops within the radius of 3 kms and the collection weighs upto 10-15 kgs in total each day

The silver nitrate powder in India costs approximately 3000-4000 for 100 grams.

Thanks for your queries.It would be better if you could kindly frame elongated questions which will help me answer you better.

Hey kenya Endo.You can refer this link
This helped me understand the use of silver to make the water safe.In the filters here the waste act as a secondary solution,primary being the silver nano particles.
Your Idea of using microorganism sounds interesting to clean water.I am yet to read the entire idea though.Good luck!!!