Objective: Description of the knowledge to use the distributed processing of the villagers of the island of Cat Ba, Hai Phong 2015. Subjects and Methods Study: Description cut of 3 households Tran Chau, Xuan Dam, Hien Hao commune was chosen as the subject of investigation. Result: people use septic tanks (59.5 percent), followed by 2 separated toilets (14.6 percent), one of the few still use bucket latrines / 1 compartment (8.6 percent), infiltration excess (7.7 percent). The proportion who said knowledge about the hygiene standards of the septic tank is not high: Distance 10m compared to wells (36.0 percent); Distance 15m compared housing (36.9 percent); Button right technical water (20.3 percent); No flies (25.3 percent), no odor (22.4 percent); Sufficient water after passing (26.9 percent); Having cleaned frequently (31.1 percent). The proportion who said knowledge about the hygiene standards of latrine 2 compartment relatively high: Distance 6 m with wells (100.0 percent); Distribution chamber without cracks, water could not access (83.0 percent); Fillers, odorless (98.3 percent); Do not use 2 stop at the same time (67.7 percent).
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