Si Collection, Upper Volume Radical: Water (shuǐ) 濾 Kangxi stroke count: 19 Page 658, Entry 06 Pronounced lu (falling tone) According to the Collection of Rhymes (Jiyun) and Correct Rhymes (Zhengyun), it is pronounced lu (falling tone); according to the Rhyme Collection (Yunhui), it is pronounced lu (falling tone). According to the Jade Chapters (Yupian), it means to filter water. It also means to wash or to clarify. In the Rhapsody on the Water-Filtering Silk (Lüshuilluofu) by Bai Xingjian of the Tang dynasty, the commentary states that the silk refers to a device for filtering water, made of light gauze or coarse hemp cloth. When the dregs remain above and the water passes below, the water becomes pure and clean.