无害化粪池的形式很多,我们遵照毛主席“自力更生”的教导,在古坟和某地修建防空洞的启发下,在我县洪塘公社依靠贫下中农建造了二合土无害化粪池。这种粪池以土为主,适宜平原地区缺少建筑材料地区使用,成本只占水泥砖石结构无害化粪池的15%,使用方便,牢固耐用,进出粪口均采用水封式,减轻 Harmless septic tanks in many forms, we follow Chairman Mao “self-reliance” under the guidance of ancient burial mounds and a bomb shelter built under the inspiration in our county Hongtong commune to rely on poor middle peasants to build two soil harmless septic tanks . This septic tank is dominated by soil and is suitable for use in areas lacking construction materials in the plain area. The cost is only 15% of the harmless septic tank with cement masonry structure. It is easy to use, durable and durable.