Africa, Kenya, Naivasha. Sanivation project. Africa, Kenya, Naivasha. Sanivation project. James Mugweru (a farmer) & his wife Margaret Wambui use the blue box, a home toilet system. Sanivation provides clean sanitation service in homes. The toilet is serviced and fecal sludge is treated with solar thermal heat treatment, then mixed with water and charcoal dust to make briquettes. Finished briquettes are sold to local vendors to be sold as cost efficient fuel to local customers.