Directions for use: 1. Following dosage chart below, add the recommended "Initial Dosage" of SCALEfree directly to the pool. 2. If water hardness level is above 500ppm (parts per million), double the recommended dose 3. Brushing is required Monthly Maintenance: After initial treatment, add SCALEfree monthly according to recommended dosage chart to maintain scale and stain protection throughout the season. Note: For new, remodeled or refinished pools, add SCALEfree following initial dosage instructions. Add product to pool water during filling to prevent plaster dust formation, scaling and metal staining.