Nevertheless, not everything is so simple, in addition to the above, it is worth starting from the material from which the bath is made and from its functionality. So the steel bath will require you to install a special pillow, which will prevent enamel damage due to the deformations of the walls under the weight of water and body weight. The pillow is made of foam concrete blocks or bricks, filling the space between them with a foam of the installation. You can do and only foam, but in any case put the material under the water filled with water.