GLB Pool and Spa Products 71414 1-Pound Oxy-Brite Pool Water Shock Non-Chlorine Pool Shock Oxidizer Makes water Crystal Clear Lowers Irritation For more than 30 years, oxy-brite has offered a non-chlorine alternative for shock oxidizing pool water In addition to its effective shock oxidation treatment, oxy-brite includes unique blue water brightening crystals that polish the water Swim immediately after treatment; restores sparkle to cloudy water Reduces sanitizer demand; this item is not for sale in Catalina island Measures 7.5-inches in length by 5-inches in width by 0.5-inches in height