By reducing material and labor costs, we bring you a premium hot tub experience at a. Freeflow Spas are manufactured using rotational molding making them .
Rotationally molded hot tubs, also referred to as roto-molded hot tubs, emerged and have been one of the best options for decent hydrotherapy at. Roto–
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. and benefits of both, they both have their advantages. Roto vs. Acrylic spas, best?. began to produce spas with a radical new concept â€“ rotational molding.