Since the bottom of the 25 kg plastic bucket will inevitably protrude into the tank to form a spherical crown during molding, the foundation should be made into a spherical crown similar to the bottom shape, and there is no need to pave sand into a ball corresponding to the bottom of the tank on a horizontal basis. Corona, when used in the open air, should be properly avoided direct sunlight to prolong the service life. The foundation for installing plastic tanks is required to be level and able to withstand corresponding pressure. For example, with steel structure, the gap should not be too large, and wooden or iron plates should be laid on it. When plastic tanks store chemicals, there should be good drainage trenches and dilution devices around the site.