Fiberglass Modular Tanks due to the fact that all components of the Fiberglass tanks are dispatched to the project site separately and there is an operation to assemble. In case of any problem, it is possible to easily replace and modulate the Fiberglass tank by emptying the tank. However, other tanks, including concrete and metal, do not have the possibility of convenient displacement and replacement of separate tank components. The Fiberglass resin has durability and chemical and physical resistance. The ability to produce a modular Fiberglass tank in any size and volume is another benefit of the fiberglass modular tank, while concrete and metal tanks are usable for very high volumes, which do not have a long life and durability. Modular fiberglass tanks can be used in atmospheric conditions and the time to run the tank is very short, while the concrete and metal tank is not usable in all atmospheric conditions and has a very long time to install, however, the use of fiberglass tank due to the aesthetic view of them is other advantage of fiberglass modular tanks compared to concrete and metal tanks.