This is an easy one “cost”. A lot of manufactures have cut comers to make more of a profit. They figure you are putting the spa on a flat surface so you don’t need a bottom. That’s crazy! What happens if you put it on a deck, there are gaps in the boards and critters will move in, tunneling through the foam (not good). Buy a spa with a molded ABS sealed floor.
Posted in: Hot Tubs and Spas