Open Philanthropy recommended a grant of $48,823,039 to Evidence Action to support their Dispensers for Safe Water program. The program installs, maintains, and promotes the use of chlorine dispensers in rural areas in Kenya, Malawi, and Uganda. This grant was made on GiveWell’s recommendation.
See GiveWell’s page on this grant for more details.
Note that GiveWell’s figure of “up to $64.7 million” includes a potential exit grant that may or may not be released — see here for more details.