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Hi Bob

I had not heard of the specific solution by Potter without Borders work but low cost filters of different materials are widely used and adopted in different countries based on local technology availability. I agree that performing a more detailed assessment of the treatment capacity with water quality testing is an important validation of the treatment capacity of the filters. Is there any data on water quality improvements? Other aspects to consider are - long term life cycle of the solution, maintenance needed etc For water quality testing there are many portable kits (DelAgua, Aquagenix for example) or use of laboratories for testing.

Best