• Epoxy coating was applied to existing water purification plants, reservoirs, drainage basins, public facilities, multi-family houses, apartments, and large-sized concrete structures, but sludge adhesion and moss generation and corrosion
• Moss production, corrosion, cracking of damaged walls => deterioration of water purification function
• Aged and severe leak due to the limit of the life of the structure
• Severe damage to the structure due to the lack of separate repair work for the aged reservoir
• In order to carry out the coating method (mortar, epoxy, ceramic, silicon), it is necessary to pay attention to additional structure repair work.