Prevent cloudy water and staining from dissolved metals with HTH metal and stain defense. Apply directly to the pool as part of your regular maintenance routine to prevent metal stains and scaling, remove fresh metal stains, and prevent mineral deposits from forming on equipment. The HTH Metal & Stain Defense is great for all pool types including saltwater pools and vinyl-lined swimming pools. About the Brand: HTH was developed with the consumer in mind, offering products that are both economical and powerful enough for the toughest jobs