江南一带,河道众多,但当初还没通自来水的时候,一般人都是打井水来饮用,因此家家户户都有一口水缸。打来的井水要加点儿明矾沉淀,沉在缸底的污水则用一根竹筒汲出来。竹筒一头留着一节,上面开一个小孔,拇指正好按住。按住小孔将竹筒插到缸底,再放开拇指,让竹筒汲取缸底污水,再按住小孔,里面的水便不会流出来,然后提出来将这些污水放掉,剩下的就是净水,平时用来做饭。 Jiangnan area, many rivers, but did not pass when the tap water, most people are playing well water to drink, so every household has a water tank. Call well water to add some alum precipitation, sinking in the bottom of the sewage is a bamboo tube out. Keep a bamboo section, open a small hole above, thumb just hold down. Hold down the hole to the bamboo cylinder inserted into the bottom of the cylinder, and then release the thumb, so that the bamboo cylinder to absorb the bottom of the sewage, and then hold the hole, the water will not flow out, and then put these sewage let go, the rest Is pure water, usually used to cook.