Caribbean Spa Fast-Dissolving Chlorine-Free Shock Oxidizer for Hot Tubs Presented by Pool Stuff Express (5Lb) COMPATIBLE- Can be used in conjunction with chlorine, bromine, copper-silver ionization, minerals, and chlorine generators CLEAN- Use in any spa regularly to oxidize waste from the water EASY TO USE- Fine granules are fast-dissolving REDUCE CHEMICAL WASTE- Only 2 tablespoons per 200 gallons needed to work effectively MADE IN THE U.S.A.