This report describes the results of a six month monitoring program by the Bicol River Basin Development Program (BRBDP) covering the operation of three pilot coconut fiber/burnt rice husks filters (known as the Frankel Filter Project) in the barrios of Balagbag, Milaor; San Francisco (Bawa), Canaman; and San Juan, Magarao. This period began in May 1976. The period was extended to permit gathering of more water samples and additional analyses of water quality data.