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一、不沉的六六六石膏球在大连曾试用过一种六六六石膏砖,证明有持久的杀灭水中蚊子幼虫的作用。方法是将六六六凝固在石膏及木屑内,这样,六六六便可缓慢的通过木屑的空隙溶解到水里,达到持久杀灭蚊幼的作用。一般所制的石膏砖的缺点是不能飘浮在水面,沉入水底,可陷入污泥而失效。因此,有用木板将石膏砖托在上面,或在砖里埋一小绳,把砖绑在竹竿上。
First, unsinkable BHC sixty-six plaster balls have tried a 666 gypsum brick in Dalian to prove that there is a lasting effect of killing mosquito larvae in the water. The method is to coagulate BHC into gypsum and sawdust, so that BHC can slowly dissolve into the water through the gaps of the sawdust and achieve the effect of killing mosquito larvae for a long time. Gypsum brick made of the general drawback is not floating in the water, sinking into the water, can be trapped in the sludge and failure. Therefore, the use of wood to plaster brick on the top, or buried in the brick a small rope, the brick tied to the bamboo pole.