About This Item Minerals from source water, pool equipment and water maintenance products like algaecides can cause stains, pool scale buildup and cloudy water. The powerful action in HTH Metal, Stain and Scale Control helps dissolve and remove fresh metal and copper stains, prevents mineral deposits and pool scale from forming on surfaces and equipment and keeps your water crystal clear. This product is great for all swimming pools including vinyl-lined and salt water systems. How To Use HTH Metal, Stain and Scale Control Simply follow the on-pack instructions (or refer to the chart above) to measure the correct dosage amount according to your pool size (32 oz treats one 10,000 gal swimming pool). Add the product directly to your pool. After the initial treatment, use HTH Metal, Stain and Scale Control as part of your regular maintenance routine. About HTH Pool Care HTH was developed with the pool owner in mind. We know that maintaining your pool water can be a lot of work. That’s why we're here every step of the way, helping you clear the uncertainty from pool care. With economical, easy-to-use solutions, HTH is designed to work hard so You're prepared to tackle whatever life throws in your pool. From balancing your water to treating green water, we offer a full line of products to keep your pool water healthy and your swimmers happy.