Blue Horizons Flockfix Cartridges are designed to assist the filter in removing small suspended particles to ensure sparkling clear water. They can also help remove copper, iron & manganese from pool water. Blue Horizons Flockfix Cartridges Application Instructions: 1. Maintain pH levels within the ideal range 7.2 - 7.6. Adjust if necessary. 2. Maintain total alkalinity within the ideal range of 80 - 150 mg/l (ppm). Adjust if necessary. 3. Maintain chlorine levels within the ideal range 1 - 3 mg/l (ppm). Adjust if necessary. 4. Backwash the filter and then return to the normal filtration setting prior to use. 5. Ensure the skimmer basket is clean and free of any other chemicals. 6. Add 1 cartridge per 50,000ltrs (11,000 gallons) of pool water per week. Blue Horizons Flockfix Cartridges General Precautions: - Never mix with any other chemicals including cleaning products and chlorine products, as a dangerous reaction may occur. Blue Horizons Flockfix CartridgesHandling/Storage: -