Study Region: Yangcheng Lake is located northeast of Suzhou city. one of the most economically developed cities in the Yangtze River Delta plain. China. Yangcheng Lake serves as a storage pool for flood control and water diversion; as well as a potable water source for Suzhou City. https://www.roneverhart.com/Pure-27-Blemish-Correcting-Purifying-Fluid/