Dear Mr. Faruque One option ...

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Dear Mr. Faruque

One option seems Table top filters. Filter models that were tested by the Testing scheme 2 of the WHO and which comply with WHO indicators for removal of bacteria and protozoa are Nazava filters www.nazava.com  and  Tulip filters of Basic Water Needs.  www.basicwaterneeds.com

Regards

Henk Holtslag