Aquatic is adding eight new modern-style, drop-in tubs to its best-selling Serenity series, renowned for offering the ultimate in personalized hydrotherapy. With the Serenity expansion, customers can choose from 55 freestanding, undermount and drop-in, acrylic shells in a variety of sizes, finishes and colors, and also customizable as soaker, HotSoak, air bath or DriftBath tubs. The DriftBath simulates the relaxing experience of sitting in a gentle stream.