The early nineteenth century, the Yu family in Jiangsu and Zhejiang provinces, engaged in traditional filter production, which was mainly supplied to the tofu manual workshops and sugar production workshops, etc.
- Guangde Huilong Enviroment Technology Co,.Ltd Founded, HL filter Guangde factory in construction(100 acres)
- Huilong Kunshan Factory opening
- Four star Huilong Hotel foundation in Taizhou Zhejiang
- Guangzhou AKF filter equipment Co,.Ltd founded
- HL filter Suzhou (Suzhou Huilong Purification Filter Co.,Ltd) founded
- HL filter Hongkong(Huilong(H.K)INT’ Development Co.,Ltd) founded
- HL filter Shanghai company founded
- HL filter Guangzhou（Guangzhou Longhuilong Filter Co.,Ltd）founded
- Family owned workshop in Zhejiang.