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There are a number of resources available for household-level water treatment (HWTS) solutions on CAWST's new HWTS knowledge base here: https://www.hwts.info (it's still under development).
As mentioned by others above, the key is the implementation approach, not just the technology. Feel free to contact Paul Earwaker (pearwaker@cawst.org), CAWST's technical advisor for Kenya who has a lot of experience in HH level water treatment implementation and is familiar with the Kenyan context.