For most of its history, a teawright created pu-erh using the techniques to make sheng. But, the process is slow, and it takes many years for pu-erh tea to be crafted this way. As demand for pu-erh increased, many tea companies began to look for a way to speed up the process. So, in 1973, the Menghai Tea Factory and the Kunning Tea Factory devolved a method they called “Wo Dui”. This roughly means “wet piling” in English.