Prevents Stains & Scale: Protects spa surfaces from unsightly stains and scale build-up. Protects Equipment: Clorox Pool & Spa Stain & Scale Control protects equipment from metal stains Easy to Use: Simply add to spa water to prevent and remove stains and scale. Consistent Protection: Works continuously to prevent scale formation and metal stains, ensuring a clean and well-maintained spa environment. Ideal for All Spas: Suitable for use in all types of spas, including plaster, vinyl, and fiberglass. Clorox Pool App: Test like an expert anytime, anywhere with the Clorox Pool App. Solve common swimming pool problems and get personalized product and dosage recommendations.