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SCALEfree protects pools from the damaging effects of scale buildup and staining due to excessive calcium, iron, copper and other minerals. It works without the use of phosphates or harsh acids. SCALEfree also works to prevent scale from forming on salt generator cells, helping to maintain optimum performance. SCALEfree can be used with most sanitizing systems and is compatible with all pool surfaces. This product is designed for use in properly balanced pool water. Following dosage chart below, add the recommended initial dosage of SCALEfree directly to the pool. Note: If water hardness level in existing pool water is above 500ppm (parts per million), follow recommendations for fresh fill initial dose. Brushing is required. After initial dose, proceed with recommended maintenance. Do not use with biguanides. * If preferred, SCALEfree can be added weekly. Take the recommended monthly dosage and divide it by 4. Important: SCALEfree works by keeping calcium and other metals in solution so they are unable to form scale or stains on pool finishes. It does not physically remove the calcium or other metals from the water and therefore will not affect readings on water test results. 1 Buy = Two Bottles (2L Each)!