SPA MARVEL can replace or greatly reduce your need for the vast majority of spa-care chemicals. Step 1: Remove Filters. Spa Marvel Cleanser is a fast acting proprietary cleanser that penetrates deep inside our spa’s plumbing and equipment, removing organic, mineral and chemical contaminants. In brand new spas, Spa Marvel Cleanser removes residues leftover from the manufacturing process. Use as directed. Step 2: Use Spa Marvel Filter Cleaner as directed. Step 3: Fill/refill spa with X10 Water Filter attached to hose. Step 4: Spa Marvel Water Treatment and Conditioner is a unique formulation of natural enzymes, minerals and plant extracts and contains no harsh chemicals. Add Spa Marvel Water Treatment and Conditioner as directed for naturally conditioned spa water.