<p>Fang Ji has two types, Han Fang Ji and Mu Fang Ji. I find Mu Fang Ji completely ineffective compared to Han Fang Ji. Han Fang Ji has been very effective for treating water toxins. Tao Hongjing said, &ldquo;Good quality Fang Ji is large, bluish white in colour and soft in texture. Inferior Fang Ji is hard like wood with black spots.&rdquo; Li Dangzhi said, &ldquo;The stem of Fang Ji is like a vine. The root is white on the outside and yellow on the inside like Jie Geng. Good quality Fang Ji has black stripes inside the root like the spokes of a wheel.&rdquo; Song said, &ldquo;Fang Ji produced in Hanzhong has spoke-like stripes. Its root is yellow, firm and fragrant. When a person breaks its stem and then blows from one side, air will comes from the other side, like Mu Tong. Mu Fang Ji is blue white in colour, fishy smelling, with wrinkles and small protrusions on the skin.&rdquo;</p>
