Riding the carousel: Rotomolded spas offer high-end quality at an affordable price.

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Rotational molding was invented in the mid-1800s as a means of producing hollow objects with consistent wall thicknesses. Since then, the process has been used to make everything from playground equipment to artillery shells. Today‚Äôs molds are filled with polyethylene powder the consistency of granulated sugar (the stuff plastic soda bottles are made of), then […]