The new spa needs a good foundation. The surface on which the spa must be capable of supporting the spa must support the weight of the water in it and those who occupy it. If the foundation is inadequate, it can move or collapse while the spa is in place, causing stress on the walls of the tank and the components.
Damage caused by inadequate or improper support is not covered by the warranty of the spa. It is the responsibility of the spa owner to provide a good foundation for the spa.
Ensure that the foundation on which the spa is placed allows the water to flow from the spa. Good drainage helps to let the components dry after rain or wet weather.
If the choice is the spa indoors, pay special attention to the ground that supports it. Never forget that a spa is filled with water. Choose a soil that will not be soiled or destroyed by water. Ask the installer to verify that the soil can support the weight, spillage and splashing water from the spa.
The weight of the spa must always be taken into consideration when setting up the spa. If the spa is installed on a raised wooden deck or an other structure, it is advisable to consult a structural engineer or contractor to ensure that the structure supports the weight.
IT IS STRONGLY RECOMMENDED THAT A QUALIFIED CONTRACTOR, CHARTERED, PREPARE FOUNDATION FOR SPA.
There is a specification of minimum depth of 10 cm (4 inches) for a concrete pad