Spa Marvel Water Treatment & Conditioner is a quality, environmentally-friendly, enzyme based hot tub water treatment product.  It helps prevent scum lines, maintain the pH and alkalinity balance of your tub as well as preventing scale build up from hard water.  It can act as a defoaming agent as well thus creating water that is soft, odorless and enjoyable.  If you've had skin sensitivity issues with eczema or psoriasis in the past because of harsh chemicals in hot tub water, Spa Marvel Water Treatment and Conditioner has been noted to help skin sensitivity issues because of its natural make up.