The best surface is a concrete slab that will not move. If the base can move then your warranty will be void and the swim spa could crack due to movement and stress to the shell. In general, for swim spas the base must be able to support 1000kg per square metre and this requires a level slab that is 50mm (6”) minimum thickness with F72 reinforcing mesh. You should consult a specialist if you are unsure of your soil type.

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