Hi Rajiv, thank you for your comment and questions. Aqua Clara water filters use hollow fibre membrane technology, which has pores small enough to remove 99.999% of bacteria and parasites. Since bacteria and parasites account for a vast majority of water borne diseases in Kenya, households using our filters have reported a drastic improvement in their health. The governemnt's standardisation authority KEBS has tested our filters and approved them for distribution as they meet and exceed all their drinking water requirements. We also carry out 100% follow up on all filters sold to ensure that customers know how to use and maintain their filters correctly. Finally, each year we test 10% of all filters with results indicating that over 90% of the filters remain in active use beyond the first 12 months.