Si Collection, Upper Volume Radical: Water (shuǐ) 濾 Kangxi strokes: 19 Page 658, Entry 08 Pronounced lü. Collected Rimes (Jiyun) and Correct Rimes (Zhengyun) indicate pronunciation as lü (falling tone). Collection of Rimes (Yunhui) indicates pronunciation as lü (falling tone). In the Comprehensive Glossary (Yupian), it means to filter water. It also means to wash or to clarify. In the poem Filter Water Silk (Lüshuiluofu) by Bai Xingjian of the Tang dynasty, the commentary notes that the silk is a tool for filtering water, made from light gauze or coarse hemp cloth. The dregs remain on top while the water passes below, rendering the water clean and pure.