Metal Out is used to remove metals from pool water and to prevent staining of pool surfaces by metals such as Copper, Iron and Manganese. Dosage and Directions for use: Discoloured Pool Water: Use 250ml per 10 000L of pool water for every 1ppm of metals present in the pool water. For every additional 1ppm of metals, use an additional 250ml per 10 000L of pool water. If the metals are present in the source water, use a maintenance dosage of 25mls per 10 000L weekly. For best results do not shock-treat or superchlorinate your pool water for at least 5 days after the Metal Out treatment. Stains: Use 250ml of Metal Out in areas where the stains have occurred. Brush the stains once daily for at least 4-7 days.