Spa Marvel Cleanser is a fast-acting proprietary hot tub plumbing cleaner that penetrates deep inside of your spa’s plumbing and equipment, removing biofilm, organic, mineral and chemical contaminants thereby prolonging the life of your spa and hot tub equipment. In brand new spas, Spa Marvel Cleanser removes residues left over from the manufacturing process including waxes, oils, and resins. It is the perfect spa & hot tub pipe cleaner to use before using Spa Marvel Water Treatment & Conditioner. If you do not use the Spa Marvel Cleanser the natural descalers contained in the Spa Marvel Water Treatment & Conditioner will clean out residue from the manufacturing process and accumulation from past use. This may cause water quality issues. Step #1. Open all jets and water features. Step #2. Remove filters. You will not harm your spa by operating it with the filters out. Step #3. Pour 1 bottle of Spa Marvel Cleanser into the existing water. Turn pumps on high for at least 1 hour. If the spa is less than 3 months old, or if Spa Marvel Water Treatment has been used in the existing water, drain the spa after 1 hour. Otherwise, leave the Cleanser in the water for at least another 23 hours on the regular filtration cycles. It is okay to leave Spa Marvel Cleanser in the water for more than 23 hours if need be. Do not allow bathers to enter the spa with Cleanser in the water. Drain the spa, rinse it out and refill as per manufacturer’s directions. Repeat before every water change.