BioGuard Mineral Springs Stain and Scale (qt) BioGuard Mineral Springs Stain & Scale 1qt Protects chlorine generator cell and pool equipment from scale and buildup Simply add Mineral Springs Stain & Scale at the start of your pool season and treat your pool weekly with Mineral Springs Renewal Keeps chlorine generator cell working at optimal performance 32fl oz per 5,000 gallons of water per season