Wastewater from the entire building flows into a holding tank where solids settle, like in a septic tank.
整座大楼的废水流进一个蓄水池。就像在化粪池里一样，固体被沉淀。
2
Water tank tap water comes into this old yard, but people here keep the habit of saving water with bit tank in order to settle the impurity of water and save the water in case of tap-losing.
The new fuel providing device is designed for hand-start gasoline generating set to settle the low position of the fuel tank or bad fuel providing device when the fuel pressure is low.