you are using is approved for drinking. The surface of the concrete tank was severely damaged, and peeling and cracks caused water to escape.The water tank should be cleaned before carrying out any repair or coating work. Seal and repair cracks in concrete when it is important to quickly prevent water from leaking through the crack. Seal those cracks in concrete by injecting epoxy or polyurethane sealant. Our water tank cap is a simple and effective solution for any type of tank. Age-related lack of concrete is common in old buildings. Water can not only threaten the integrity of the foundation, but also create an environment in which mold can grow on the porous surface of the concrete. After curing, our injection system is completely flexible and will develop and shrink with concrete in the coming years.