| 31 | Manufacturing and installation of backwash equipment | GNS Engineering | Gongju | 2018.02 |
| 32 | Plating plant absorption tower (sclava) repair work | KHE Co., Ltd. | KHE Co., Ltd. | 2018. 04 |
| 33 | Performance improvement design and test run thalliac piping work | HiNTech Co., Ltd. | Gwangju Sewage Treatment Plant | 2018. 04 |
| 34 | Desulfurizer replacement and piping work | ATE Co., Ltd. | Gunsan Sewage Treatment Plant | 2018. 04 |
| 35 | Hyocheon Sewage Treatment Plant Tally Filtration Pipe Supplementation Work | HiNTech Co., Ltd. | Hyocheon Sewage Treatment Plant | 2018.04 |
| 36 | Hyocheon Sewage Treatment Plant Inlet Pipe Installation Work | HiNTech Co., Ltd. | Hyocheon Sewage Treatment Plant | 2018. 04 |
| 37 | Performance improvement design and test operation. | HiNTech Co., Ltd. | Hyocheon Sewage Treatment Plant | 2018. 07 |
| 38 | Drum screen installation work | HiNTech Co., Ltd. | Hyocheon Sewage Treatment Plant | 2018.07 |
| 39 | Belt conveyor repair | HiNTech Co., Ltd. | Hyocheon Sewage Treatment Plant | 2018.07 |
| 40 | Sulfuric acid transfer pump installation and piping work | J&HC Co., Ltd. | Hyocheon Sewage Treatment Plant | 2018.07 |
| 41 | Plating factory hydrochloric acid diffusion prevention facility installation work | KHE Co., Ltd. | KHE Co., Ltd. | 2018. 07 |
| 42 | Weight system-related piping modification work | Securit Co., Ltd. Gunsan | Korea Securit Co., Ltd. | 2018.09 |
| 43 | Scrava manufacturing and installation work | Hanmi Tech | Gunsan Sewage Treatment Plant | 2018. 11 |
| 44 | Production and delivery of wastewater treatment plant | HNTech Co., Ltd. | HNTech Co., Ltd. | 2018. 11 |
| 45 | Chemical tank installation and plumbing work | Samho Chemssana Co., Ltd. | Samho Chemssana Co., Ltd. | 2018. 11 |
| 46 | Manufacturing and installation of iron manganese removal equipment | GNS Engineering | gongju | 2018. 11 |
| 47 | Installation of manned fan and air supply drain plate at tertiary treatment facility | HiNTech Co., Ltd. | Pyeongtaek Godeok Sewage Treatment Plant | 2018. 11 |
| 48 | 12 cases including odor prevention facility repair work | HiNTech Co., Ltd. | Pyeongtaek Godeok Sewage Treatment Plant | 2018. 12 |
| 49 | Fan balancing and bearing replacement | Korea TV | Pyeongtaek Godeok Sewage Treatment Plant | 2019. 01 |
| 50 | HNP Grinding water tank repair work | Securit Co., Ltd. Gunsan | Korea Securit Co., Ltd. | 2019. 01 |
| 51 | Wastewater treatment plant level sensor replacement work | Gunsan Medical Center | Gunsan Medical Center | 2019.01 |
| 52 | Bag filter installation work | Lucky Wood Co., Ltd. | Lucky Wood | 2019.02 |
| 53 | Activated carbon dust collector repair work | Kangsan E&C | Korea Securit Co., Ltd. | 2019. 02 |
| 54 | Bag filter installation work | Lucky Environment Co., Ltd. | Lucky Wood | 2019.04 |
| 55 | Conveyor belt cover installation work | HiNTech Co., Ltd. | Gunsan Sewage Treatment Plant | 2019.05 |
| 56 | Groundwater water treatment system installation work | GNS Engineering | Pocheon military unit | 2019. 05 |
| 57 | New wastewater treatment plant installation work | farmers food | Jongcheon Agricultural and Industrial Complex | 2019. 06 |
| 58 | Installation of automatic polymer dissolution device in the dehydrator room of the second treatment facility | HiNTech Co., Ltd. | Guri Sewage Treatment Plant | 2019. 08 |
| 59 | Filtration tank installation work | Kangsan E&C | Gunsan Wolmyeong Swimming Pool | 2019.09 |
| 60 | High-concentration deodorization facility reinforcement work | HiNTech Co., Ltd. | Pyeongtaek Wastewater Treatment Plant | 2019. 09 |
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