Kudos for the effort ,But their are ways to serve more people in the same budget ,Why R.O. Based technology , do we have a representative analysis report , Rain water which is already deficient with Total dissolved solids and Total hardness etc. if passed through R.O will be more problematic . Instead a simple coaguant and disinfactant mixture will be more suitable , Mix this coagulant in bucket of say 20 lit of stroam water . Leave it for half an hour . Decant it and mix with one spoon full of bleaching powder leave it for 4 - 6 hour Decant it if required and use it. any way just an opinion , Once again congratulation for great effort.

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Kudos for the effort ,But their are ways to serve more people in the same budget ,Why R.O. Based technology , do we have a representative analysis report , Rain water which is already deficient with Total dissolved solids and Total hardness etc. if passed through R.O will be more problematic . Instead a simple coaguant and disinfactant mixture will be more suitable , Mix this coagulant in bucket of say 20 lit of stroam water . Leave it for half an hour . Decant it and mix with one spoon full of bleaching powder leave it for 4 - 6 hour Decant it if required and use it. any way just an opinion , Once again congratulation for great effort.