Pool Rx Plus Black Algaecide Unit Treats 7500 - 20000 Gallon Swimming Pool

Maintenance: Maintain chlorine 0.5ppm - 1.0ppm Maintain pH 7.2 - 7.8 Maintain alkalinity 80 - 120 Maintain cyanuric acid 10 - 80 Replace the unit every 12 months Add PoolRx booster after 4 - 6 months if needed Active Ingredients: Copper Sulphate Pentahydrate - 86.85% Zinc Sulfate Monohydrate - 1.51% Silver Nitrate - 0.40% Other Ingredients - 11.24%