The concentric tank walls of the Monostore system are a common way of building for (water) sewage plants. The so called inner circle of a smaller diameter is enclosed by the outer circle with a bigger diameter. We can easily build the system into the ground partially; but the system can be placed above the ground as well. Even the supply of materials to make the installation complete can be delivered and installed by Monostore.  Please take notice of our possibilities in this field, by looking at the pages elsewhere on our website.