Instructions: 1.Helps Prevent Algae and Increase the Clarity of Water 2.Provide a Constant Chlorine Does 3.Reduct the Amount of Algaecide and Flocculant You Use 4.Produce Against Chlorine Loss in Direct Sunlight While Stabilizing Them, Reduces the Amount of Chemicals You Need to Use 5.Use 7 Tablets per 2,500 Gallons of Water per Weekto Achieve Crystal 6.It Also Suitable for General Bacterial Propagules, Virus contaminated Items,and Disinfection of Heavily Contaminated. 1.Our Pool Cleaning Tablets Effectively Guard Against Bacteria, Algae and Other Organisms. These Swimming Pool Water Sanitizers Create a Safer, Cleaner, and More Enjoyable Swimming Experience. 2.Protect Against Chlorine Loss in Direct Sunlight While Stabilizing Them, Reduces the Amount of Chemicals You Need to Add. Use 7 Tablets per 2,500 Gallons of Water per Week to Achieve Crystal Clear Pool Water 3.Eliminate Bacteria and Controls Algae in the Water 4.Purify Water. No More Dirty Pool 5.Protect Against Harmful Sun Rays 6.Specification: 2 Grams per Piece,Diameter 0.65 Inches (16mm)Dosage: 50 percent Effective SubstanceUsing 2 Grams per Ton of Water Can Increase the Effective Chlorine Concentration in the Water by 1 Ppm. at the Beginning of the Swimming Season, Shock Disinfection Is Required. When Algae Appear in the Water, Add 6 10 Grams of This Product. Tons of Water Daily Maintenance: 2 Grams or Ton of Water or Day Specifications: 1 bottle of 50 Pcs, 2g each, Adaptable to Your Pool Easy to Use Long lasting Shelf Life: 24months Packaged Include : 50 or 100 or 200pcs