Pool Rx+ [Pool Rx Plus] is the updated algaecide formula from Pool Rx. Pool Rx+ contains three active ingredients, Copper Sulphate, Zinc Sulfate and Silver Nitrate, adding additional layers of protection to the original Pool Rx formula you have come to trust. The blue Pool Rx+ pool unit is an EPA Registered, NSF/ANSI 50 Certified, swimming pool algaecide supporting 7.5K-20K gallons of water. Pool Rx+ reduces chemical demand, improves water quality, simplifying pool care for up to 6 months. The Pool Rx+ pool unit is effective in rejuvenating the Pool Rx+ minerals for up to 1 year in your pool. For best results, start with a new Pool Rx+ pool unit at the beginning of each swim season. For year-round pool use, add a Pool Rx+ booster after 6 months, or if you see algae coming back sooner. Pool Rx+ products can support any size body of water & are ideal for use in Chlorine, Salt, UV or Ozone pools Product Overview Brand: poolrx Item Weight: 13.1 Ounces Item Form: Tablet Product Benefits: Controls Algae UPC: 700553310013 Product Features Eliminates all types of Pool Algae Reduces chemical demand Effective for up to 6 Months NSF/ANSI 50 Certified Ideal for Chlorine, Salt, UV or Ozone systems New formula now with 3 Active Ingredients Product Information Brand poolrx Item Weight 13.1 Ounces Item Form Tablet Product Benefits Controls Algae UPC 700553310013 Number of Items 1 Unit Count 1.0 Count Product Dimensions 3.25 x 3.25 x 4.5 inches Item Weight 13.1 ounces Manufacturer Pool Rx ASIN B09FWQ8QCH Country of Origin USA Item model number 331001 Customer Reviews Best Sellers Rank