Amaze yourself and your next guest with a unique EAGO whirlpool tub. The Benefits of a PVC Piping System. The bathtub is designed so that water never remains in the lines of the whirlpool jets or the drain. This prevents bacteria, mold, & odor buildup that can be a problem in some jetted bathtub designs. 6 Types of Massage Modes Available: a) Choose your favorite of 4 different levels of jet pressure. b) Automatic gradual change of jet pressure from low to high in a loop.