InSPAration Tranquility Aromatherapy Crystals enhance any spa experience by filling the air with a soothing blend of herbs and wildflowers that will calm even the most frayed nerves. Its unique formula can be added directly to spa water without fear of foam buildup and is compatible with all types of hot tub and spa surfaces. Best of all, Tranquility Aromatherapy Crystals contains moisturizers to keep bathers skin silky smooth regardless of how long they spend soaking.