Rendezvous Spa Specialties Enhance is a clear solution of premixed liquid bromide salts that remain as a stable bank in the spa or hot tub water until Rendezvous Activate is added. This product is completely chlorine free. It is also capable of shocking and sanitizing simultaneously. A great benefit to using Enhance is that no separate shock treatment is needed when Activate is used. This product is compatible with ozone and mineral purification systems.