ILURCO® patented system offers important advantages: Lower costs and better sealing as the installation only requires a ring beam around the tank shell instead of a complete concrete foundation. The excellent properties of the different materials are used to their fullest potential, optimizing resources to save costs (i.e., there is no need for pulling concrete). The outstanding flexibility of the base liner material makes it suitable for irregular ground surfaces. This liner material only covers the tank base, unlike others which can cover the tank shell partially, making the tank more vulnerable to corrosion without access to be repaired. Interior liner can be adapted, depending on the tank final use: potable water, water treatment, etc. All tanks are completely sectional. This flexible system allows adjustment in tank capacity, makes it easy to transport and may be improved with infinite possibilities using a lot of different accessories. Cost-effective and easy to build.